Light emitting material and organic light-emitting device

ABSTRACT

A polymer light emitting material, wherein the material has a light emitting mechanism based on transition from an excited triplet state to a ground state or transition through an excited triplet state to a ground state of an electron energy level, and the material comprises a nonionic light emitting part which constitutes a part of the polymer or is bound to the polymer. The polymer light emitting material exhibits high light emission efficiency above 5%, which is the limit of external quantum efficiency of fluorescence and can be designed so as to have a large area and hence are suitable for mass production of organic light emitting devices.

CROSS-REFERENCE TO THE RELATED APPLICATIONS

This is a divisional of application Ser. No. 10/481,442 filed Dec. 19,2003, which is a National Stage Application filed under §371 of PCTApplication No. PCT/JP02/06139 filed Jun. 20, 2002, which claims benefitof (1) Provisional Application No. 60/301,844 filed Jul. 2, 2001, (2)Provisional Application No. 60/302,372 filed Jul. 3, 2001, (3)Provisional Application No. 60/317,115 filed Sep. 6, 2001, (4)Provisional Application No. 60/330,815 filed Oct. 31, 2001, (5)Provisional Application No. 60/337,157 filed Dec. 10, 2001, (6)Provisional Application No. 60/337,160 filed Dec. 10, 2001, and (7)Provisional Application No. 60/337,161 filed Dec. 10, 2001. The entiredisclosures of the prior applications, application Ser. Nos. 10/481,442,60/301,844, 60/302,372, 60/317,115, 60/330,815, 60/337,157, 60/337,160and 60/337,161 are considered part of the disclosure of the accompanyingdivisional application and are hereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to an organic light-emitting device(OLED), especially for flat panel displays or backlights used therein,and the present invention relates to a light emitting material for OLED.

BACKGROUND ART

Since 1987 when C. W. Tang et al. of Kodak demonstrated highillumination light emission of an organic light emitting device (Appl.Phys. Lett., Vol., 51, page 913, 1987), development of materials fororganic light emitting devices and improvement of device structure havebeen rapidly made. Recently, organic light emitting devices have goneinto practical use firstly in displays for car audio sets, cellularphones and the like. Currently, to put such organic electroluminescent(EL) devices to a wider range of uses, development of materials forimproving the light emission efficiency and durability, or developmentfor applying them to full color displays are being actively made. Inparticular, on considering the use wide-spreading to the medium- orlarge-size panel or illumination, the high luminance must be moreintensified by improving the light emission efficiency.

As such light emitting materials, metal complexes such as aluminumquinolinium complexes (Alq₃), which has good light emission efficiencyso that light emission intensity is high, have been commonly used. Forforming such low molecular weight materials into a light emitting layerof an organic light emitting device, vacuum deposition and the liketechniques have been used. This has been considered to be a demerit inthe production process of the organic light emitting devices. Nature,Vol. 397, page 121 (1999) discloses that π-electron conjugated polymerssuch as poly(paraphenylene-vinylene) (PPV) and derivatives thereof(MEH-PPV) can serve as a light emitting material. These polymers havebegun to be partially used is a backlight of a clock and the like. Thesepolymer materials have not only a merit in production process becausethey can be formed into films by a casting method but also a merit in anincreased durability as compared with low molecular weight lightemitting materials. However, they have a demerit in that they have lowlight emission efficiency as compared with the low molecular weightlight emitting materials.

In the light emitting materials as mentioned above, use is made of lightemission from an excited singlet state, that is, fluorescence. Accordingto the description at page 58 of Monthly Display, October 1998, SeparateVolume “Organic EL Display”, the upper limit of the internal quantumefficiency of light emission in an organic EL has been considered to be25% from the ratio of an excited singlet state to an excited tripletstate generated by electric excitation being 1:3.

On the contrary, by using an iridium complex emitted by phosphorescencefrom an excited triplet state, M. A. Baldo et al. indicated that it ispossible to obtain an external quantum efficiency of 7.5% (thiscorresponding to an internal quantum efficiency of 37.5% assuming thatthe light out-coupling efficiency is 20%), which is higher than theexternal quantum efficiency of 5%, which has conventionally beenconsidered to be the uppermost value (Appl. Phys. Lett., Vol. 75, page 4(1999), WO00/70655). However, materials that stably emit phosphorescenceat room temperature as the iridium complex as used in the prior artcited here are extremely rare so that freedom of selection of materialsis narrow and they must be doped to a specified host compound whenactually used. Therefore, the conventional materials have thedisadvantage that selection of materials that satisfy the specificationof a display is extremely difficult to make.

On the other hand, M. A. Baldo et al., also indicated that a relativelygood light emission efficiency can be obtained by using an iridiumcomplex as a sensitizer, transferring energy from an excited tripletstate of the complex to an excited singlet state of a fluorescent dye,and finally emitting fluorescence from the excited singlet state of thefluorescent dye (Nature, Vol. 403, page 750 (2000)). This method has theadvantage in that from a number of fluorescent dyes, one that issuitable for the purpose can be selected and used. However, this processhas the great disadvantage in that it has low quantum efficiency oflight emission in principle since it involves a spin-forbidden processof transferring energy from an excited triplet state of a sensitizer toan excited singlet state of a fluorescent dye.

Next, concerning the mass production method of panels, conventionally avacuum deposition method has been used. However, the vacuum depositionmethod cannot be always suitable for mass production of panels havinglarge areas since they have the problems in that they require a vacuumequipment and it becomes more difficult to forming an organic thin filmso as to have a uniform thickness according as the film has a largerarea.

In order to improve the disadvantage, a production method using apolymer light emitting material, that is, an ink jet method and aprinting method have been developed as methods that facilitate theproduction of large area products. In particular, the printing methodcan continuously form a long film so that it is excellent in theproduction of large area products and in mass productivity.

As described above, in order to obtain an organic light emitting devicehaving a high light emission efficiency and having a large area, aphosphorescent polymer material is required. As such phosphorescentpolymer materials, polymers incorporating ruthenium complexes in themain chains or side chains of the polymers are known (Ng, P. K. et al.,Polymer Preprints., Vol. 40(2), page 1212 (1999)). These compounds areionic compounds and application of a voltage thereto causeselectrochemical light emission due to the oxidation reduction reactionat the electrodes. The electrochemical light emission shows an extremelyslow response in the order of minutes so that they are unsuitable forusual display panels.

In addition, there is a composition of poly(N-vinylcarbazole) mixed ordispersed with a low molecular weight phosphorescent compound, aniridium complex, although it cannot be said to be a polymer material ina strict sense (P. J. Djurovich et al., Polymer Preprints, Vol. 41(1),page 770 (2000)). However, there is a possibility that this material ispoor in heat stability as compared with homogeneous polymer materialsand tend to cause phase separation or segregation.

Japanese Patent Application Laid-open No. 2001-181616, Japanese PatentApplication Laid-open No. 2001-181617, and Japanese Patent ApplicationLaid-open No. 2001-247859 disclose organic light emitting materialscomposed of phosphorescent ortho-metallized palladium complex,ortho-metallized platinum complex and ortho-metallized iridium complex,respectively, and also refer to polymer compounds having these complexstructures as repeating units. However, these publications fail todisclose specific exemplification of the structure and method ofpreparing polymers that are necessary for forming polymers by bindingthe complex structures as the repeating units disclosed in thepublications and discloses no practically usable phosphorescent polymercompounds.

DISCLOSURE OF THE INVENTION

As described above, there has been no light emitting material fororganic light emitting devices having an external quantum efficiencythat exceeds 5%; which has been conventionally said to be the limitvalue of the external quantum efficiency of fluorescence. In addition,materials having high efficiencies of light emission have been demandedfrom the viewpoint of improvement in durability of the device since theyhave a small energy loss so that heat generation of the device can beprevented. Accordingly, an object of the present invention is toovercome the above-mentioned problems of the prior art and to provide anorganic light emitting device having high luminance and high durabilityand a light emitting material for use therein.

As a result of extensive studies with a view to solving theabove-mentioned problems, the inventors of the present invention havefound that binding a light emitting substance to a polymer can give riseto light emission of high efficiency from an excited triplet state, thusachieving the present invention.

The expression “binding to a polymer” as used herein means that a lightemitting substance is immobilized by some action of the polymer. Themethod of immobilization is not particularly limited and includesimmobilization by chemical bonds or physical bonds, such as covalentbond, coordinate bond, formation of charge transfer complex, ion bond,van der Waals force, and host-guest bond, e.g., intercalation.

In the present invention, a part of the structure of light emittingsubstance may forms a part of the polymer whereto the light emittingsubstance is bound, or a part of the ligand of the complex being a lightemitting substance may be incorporated into the polymer.

Also, the present inventors have found that a polymer light emittingmaterial obtained by forming a polymerizable composition containing atleast one light emitting compound into a film and then polymerizing ithas good durability and good processability and that immobilizing thelight emitting substance (light emitting part) with a polymer can giverise to light emission of high efficiency from an excited triplet stateor light emission of high efficiency through an excited triplet state,thus achieving the present invention.

That is, the present invention relates to the following light emittingmaterials and light emitting devices.

[1] A polymer light emitting material, wherein the material has a lightemitting mechanism based on transition from an excited triplet state toa ground state or transition through an excited triplet state to aground state of an electron energy level, and the material comprises anonionic light emitting part which constitutes a part of the polymer oris bound to the polymer.[2] The polymer light emitting material according to [1], wherein thelight emitting part is formed by binding a metal atom to at least onesite of the polymer.[3] The polymer light emitting material according to [2], wherein themetal atom is bound by one or more covalent bonds and/or one or morecoordinate bonds.[4] The polymer light emitting material according to [1], wherein thelight emitting part is a metal complex structure having a metal atom oran organometallic structure having a metal atom.[5] The polymer light emitting material according to [2] or [4], whereinthe metal atom is a transition metal atom.[6] The polymer light emitting material according to [5], wherein thetransition metal atom is a transition metal atom belonging to the sixthperiod of the periodic table.[7] The polymer light emitting material according to [6], wherein thetransition metal atom is iridium.[8] The polymer light emitting material according to [6], wherein thetransition metal is platinum.[9] The polymer light emitting material according to [2] or [4], whereinthe metal atom is a rare earth metal atom.[10] The polymer light emitting material according to any one of [1] to[9], wherein the light emitting part is formed by binding containing acoordinate bond formed by a metal atom and a nitrogen atom of thepolymer.[11] The polymer light emitting material according to [10], wherein thenitrogen atom of the polymer is a nitrogen atom of a pyridine skeletonand/or pyrimidine skeleton and/or quinoline skeleton on the side of thepolymer.[12] The polymer light emitting material according to [10], wherein thenitrogen atom of the polymer is a nitrogen atom of a phenylpyridineskeleton on the side of the polymer.[13] The polymer light emitting material according to [10], wherein thenitrogen atom of the polymer is a nitrogen atom of abenzothienyl-pyridine skeleton on the side of the polymer.[14] The polymer light emitting material according to [1], comprising alight emitting part that contains a phosphorescent moiety and afluorescent moiety with fluorescence occurring from the fluorescentmoiety through an excited triplet state of the phosphorescent moiety andan excited triplet state of the fluorescent moiety, wherein at least oneof the phosphorescent moiety and the fluorescent moiety constitutes apart of the polymer or is bound to the polymer.[15] The polymer light emitting material according to [1], wherein thematerial is obtained by polymerizing a polymerizable compositioncontaining at least one light emitting compound.[16] The polymer light emitting material according to [15], wherein thelight emitting compound is a polymerizable light emitting compound.[17] The polymer light emitting material according to [15], wherein thepolymer obtained by polymerizing the composition has no crosslinkingstructure.[18] The polymer light emitting material according to [16], wherein theat least one polymerizable light emitting compound is a crosslinkingpolymerizable light emitting compound having two or more polymerizablefunctional groups and the polymer after the polymerization is acrosslinked polymer.[19] The polymer light emitting material according to any one of [15] to[18], wherein the polymerizable composition contains at least onepolymerizable compound other than the light emitting compound.[20] The polymer light emitting material according to [19], wherein theat least one polymerizable compound other than the light emittingcompound is a polymerizable electron transporting compound.[21] The polymer light emitting material according to [1,9], wherein atleast one polymerizable compound other than the light emitting compoundis a crosslinking polymerizable compound having two or morepolymerizable functional groups.[22] The polymer light emitting material according to [15], wherein alight emitting part of the polymer light emitting material is a metalcomplex structure having a metal atom or an organometallic structurehaving a metal atom.[23] The polymer light emitting material according to [22], wherein themetal atom is a transition metal atom.[24] The polymer light emitting material according to [22], wherein themetal atom is a rare earth metal atom.[25] The polymer light emitting material according to any one of [22] to[24], wherein the light emitting part contains a nitrogen atom in acomplex structure forming part or in an organometallic structure formingpart.[26] The polymer light emitting material according to [25], wherein thelight emitting part has a pyridine skeleton, a pyrimidine skeletonand/or a quinoline skeleton in a complex structure forming part or in anorganometallic structure forming part.[27] The polymer light emitting material according to [16], wherein thepolymerizable light emitting compound is a polymerizable compoundrepresented by the formula (C-1) below:

wherein at least one of A^(C), B^(C), and C^(C) represents a substituenthaving a polymerizable functional group, and the remainder of A^(C),B^(C), and C^(C) independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms; and R¹ to R²¹ independently representa hydrogen atom, a halogen atom, a nitro group, an amino group, asulfonic acid group, a sulfonic acid ester group, or an organic grouphaving 1 to 20 carbon atoms which may have one or more heteroatoms.[28] The polymer light emitting material according to [16], wherein thepolymerizable light emitting compound is a polymerizable compoundrepresented by the formula (D-1) below:

wherein at least one of X^(1D), Y^(1D), and Z^(1D) represents asubstituent having a polymerizable functional group, and the remainderof X^(1D), Y^(1D), and Z^(1D) independently represent a hydrogen atom,or an organic group having 1 to 20 carbon atoms which may have one ormore heteroatoms; and R¹ to R¹⁶ independently represent a hydrogen atom,a halogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[29] The polymer light emitting material according to [16], wherein thepolymerizable light emitting compound is a polymerizable compoundrepresented by the formula (E-1) below:

wherein X^(E) represents a substituent having a polymerizable functionalgroup; R^(1E), R^(2E) and R^(3E) independently represents a hydrogenatom, a halogen atom, or an organic group having 1 to 20 carbon atoms;and R⁴ to R¹⁹ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[30] The polymer light emitting material according to [16], wherein thepolymerizable light emitting compound is a polymerizable compoundrepresented by the formula (F-1) below:

wherein at least one of X^(1F), Y^(1F) and Z^(1F) represents asubstituent having a polymerizable functional group, and the remainderof X^(1F), Y^(1F), and Z^(1F) independently represent a hydrogen atom, ahalogen atom, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms; and R¹ to R¹⁶ independently represent ahydrogen atom, a halogen atom, a nitro group, an amino group, a sulfonicacid group, a sulfonic acid ester group, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.[31] The polymer light emitting material according to [16], wherein thepolymerizable light emitting compound is a polymerizable compoundrepresented by the formula (G-1) below:

wherein L represents a monovalent anionic bidentate ligand; X^(G)represents a substituent having a polymerizable functional group; and R¹to R⁷ independently represent a hydrogen atom, a halogen atom, a nitrogroup, an amino group, a sulfonic acid group, a sulfonic acid estergroup, or an organic group having 1 to 20 carbon atoms which may haveone or more heteroatoms.[32] A light emitting composition comprising the polymer light emittingmaterial according to any one of [1] to [31], and a carrier transportingpolymer compound.[33] The light emitting composition according to [32], wherein thecarrier transporting polymer compound is a hole transporting polymercompound.[34] The light emitting composition according to [32], wherein thecarrier transporting polymer compound is an electron transportingpolymer compound.[35] A light emitting composition comprising the light emitting materialaccording to any one of [1] to [31], and a carrier transporting lowmolecular weight compound.[36] The light emitting composition according to [35], wherein thecarrier transporting low molecular weight compound is a holetransporting low molecular weight compound.[37] The light emitting composition according to [35], wherein thecarrier transporting low molecular weight compound is an electrontransporting low molecular weight compound.[38] A layer containing a light emitting material for organic lightemitting device, wherein a light emitting material is a polymer lightemitting material described in [1].[39] The layer containing a light-emitting material for organic lightemitting device according to [38], obtained by forming into a film apolymer light emitting material described in [1].[40] The layer containing a light emitting material for organic lightemitting device according to [39], wherein the polymer light emittingmaterial has no crosslinking structure.[41] The layer containing a light emitting material for organic lightemitting device according to [38], wherein the polymer light emittingmaterial is obtained by forming a polymerizable composition containingat least one light emitting compound into a film and then polymerizingit.[42] The layer containing a light emitting material for organic lightemitting device according to [41], wherein the polymer light emittingmaterial has no crosslinking structure.[43] The layer containing a light emitting material for organic lightemitting device according to [41], wherein the polymer light emittingmaterial has a crosslinking structure.[44] An organic light emitting device comprising the polymer lightemitting material according to any one of [1] to [31].[45] The organic light emitting device according to [44], comprising alight emitting layer comprising the polymer light emitting materialdescribed in any one of [1] to [31] having both sides or one sidethereof an electron transporting layer of a coated type, and/or a holetransporting layer of a coated type.

Furthermore, the present invention relates to novel polymerizablecompounds, production methods and polymers obtained by polymerizing thepolymerizable compounds represented by [A1] to [A3], [B1] to [B2], [C1]to [C60], [D1] to [D38], [E1] to [E34], [F1] to [F38], and [G1] to [G26]below.

[A1] A polymerizable compound which is a metal complex having one ormore ligands, wherein at least one ligand is a bidentate ligand havingpyridine ring which may have one or more substituents, and at least oneligand including the bidentate ligand above has a polymerizablefunctional group.[A2] The polymerizable compound according to [A1], wherein a metal ofthe metal complex is iridium.[A3] The polymerizable compound according to [A1] or [A2], wherein thebidentate ligand having pyridine ring is phenylpyridine orbenzothienylpyridine.[B1] A polymerizable compound represented by the formula (B-1):

wherein Q represents a bidentate ligand having one or more polymerizablefunctional groups, and R¹ to R¹⁶ independently represent a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group, or an organic group having 1 to 20carbon atoms which may have one or more heteroatoms.[B2] A polymerizable compound represented by the formula (B-2):

wherein Q represents a bidentate ligand having one or more polymerizablefunctional groups, and R¹ to R¹⁶ independently represent a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group, or an organic group having 1 to 20carbon atoms which may have one or more heteroatoms.[C1] A polymerizable compound represented by the formula (C-1):

wherein at least one of A^(C), B^(C), and C^(C) represents a substituenthaving a polymerizable functional group, and the remainder of A^(C),B^(C), and C^(C) independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms; and R¹ to R²¹ independently representa hydrogen atom, a halogen atom, a nitro group, an amino group, asulfonic acid group, a sulfonic acid ester group, or an organic grouphaving 1 to 20 carbon atoms which may have one or more heteroatoms.[C2] The polymerizable compound according to [C1] above, wherein atleast one of A^(C), B^(C), and C^(C) in the formula (C-1) is asubstituent having an acrylate group or a methacrylate group.[C3] The polymerizable compound according to [C2] above, wherein one ofA^(C), B^(C), and C^(C) in the formula (C-1) is a substituent having anacrylate group or a methacrylate group.[C4] A polymerizable compound represented by the formula (C-2):

wherein R¹ and R² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.[C5] The polymerizable compound according to [C4] above, wherein both R¹and R² in the formula (C-2) are a hydrogen atom.[C6] A polymerizable compound represented by the formula (C-3):

wherein R¹ and R² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.[C7] The polymerizable compound according to [C6] above, wherein both R¹and R² in the formula (C-3) are a hydrogen atom.[C8] The polymerizable compound according to [C2] above, wherein two ofAC, B^(C), and C^(C) in the formula (C-1) are substituents having anacrylate group or a methacrylate group.[C9] A polymerizable compound represented by the formula (C-4):

wherein R¹ represents a hydrogen atom, a halogen atom, a nitro group, anamino group, a sulfonic acid group, a sulfonic acid ester group, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.[C10] The polymerizable compound according to [C9] above, wherein R¹ inthe formula (C-4) is a hydrogen atom.[C11] A polymerizable compound represented by the formula (C-5):

wherein R¹ represents a hydrogen atom, a halogen atom, a nitro group, anamino group, a sulfonic acid group, a sulfonic acid ester group, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.[C12] The polymerizable compound according to [C11] above, wherein R¹ inthe formula (C-5) is a hydrogen atom.[C13] The polymerizable compound according to [C2] above, wherein all ofA^(C), B^(C), and C^(C) in the formula (C-1) are a substituent having anacrylate group or a methacrylate group.[C14] A polymerizable compound represented by the formula (C-6):

[C15] A polymerizable compound represented by the formula (C-7):

[C16] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-1):

wherein at least one of A^(C), B^(C), and C^(C) represents a substituenthaving a polymerizable functional group, and the remainder of A^(C),B^(C), and C^(C) independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms; and R¹ to R²¹ independently representa hydrogen atom, a halogen atom, a nitro group, an amino group, asulfonic acid group, a sulfonic acid ester group, or an organic grouphaving 1 to 20 carbon atoms which may have one or more heteroatoms.[C17] The polymer according to [C16] above, wherein at least one ofA^(C), B^(C), and C^(C) in the formula (C-1) is a substituent having anacrylate group or a methacrylate group.[C18] The polymer according to [C17] above, wherein one of A^(C), B^(C),and C^(C) in the formula (C-1) is a substituent having an acrylate groupor a methacrylate group.[C19] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-2):

wherein R¹ and R² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.[C20] The polymer according to [C19] above, wherein both R¹ and R² inthe formula (C-2) are a hydrogen atom.[C21] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-3):

wherein R¹ and R² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.[C22] The polymer according to [C21] above, wherein both R¹ and R² inthe formula (C-3) are a hydrogen atom.[C23] The polymer according to [C17] above, wherein two of A^(C), B^(C),and C^(C) in the formula (C-1) are substituents having an acrylate groupor a methacrylate group.[C24] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-4):

wherein R¹ represents a hydrogen atom, a halogen atom, a nitro group, anamino group, a sulfonic acid group, a sulfonic acid ester group, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.[C25] The polymer according to [C24] above, wherein R¹ in the formula(C-4) is a hydrogen atom.[C26] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-5):

wherein R¹ represents a hydrogen atom, a halogen atom, a nitro group, anamino group, a sulfonic acid group, a sulfonic acid ester group, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.[C27] The polymer according to [C26] above, wherein R¹ in the formula(C-5) is a hydrogen atom.[C28] The polymer according to [C17] above, wherein all of A^(C), B^(C),and C^(C) in the formula (C-1) are a substituent having an acrylategroup or a methacrylate group.[C29] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-6):

[C30] A polymer obtained by polymerizing the polymerizable compoundrepresented by the formula (C-7):

[C31] A copolymer comprising at least one of monomer units derived fromthe polymerizable compounds represented by any one of the formulae (C-1)to (C-7).[C32] A method of producing a polymerizable compound containing amononuclear iridium complex, comprising reacting a binuclear iridiumcomplex represented by the formula (C-8) with a phenylpyridinederivative represented by the formula (C-9), and then reacting areactive substituent of the reaction product with a compound having apolymerizable functional group;

wherein X^(C) and Y^(C) independently represent a reactive substituent,or a hydrogen atom, a halogen atom, a nitro group, an amino group, asulfonic acid group, a sulfonic acid ester group, or an organic grouphaving 1 to 20 carbon atoms which may have one or more heteroatoms, andR¹ to R²⁸ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms;

wherein Z^(C) represents a reactive substituent, or a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms, and R¹ to R⁷ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms, provided that at least one of X^(C) and Y^(C) in theformula (C-8) and Z^(C) in the formula (C-9) is a reactive substituent.[C33] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C32] above, wherein X^(C) andY^(C) in the formula (C-8) independently represent a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms, and Z^(C) in the formula(C-9) represents a reactive substituent.[C34] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C33] above, wherein Z^(C) inthe formula (C-9) represents a hydroxyl group.[C35] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C34] above, wherein thecompound having a polymerizable functional group is an acid halide.[C36] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C34] above, wherein thecompound having a polymerizable functional group is an isocyanatecompound.[C37] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C32] above, wherein X^(C) andY^(C) in the formula (C-8) independently represent a reactivesubstituent, and Z^(C) in the formula (C-9) represents a hydrogen atom,a halogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[C38] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C37] above, wherein Z^(C) inthe formula (C-9) represents a hydroxyl group.[C39] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C38] above, wherein thecompound having a polymerizable functional group is an acid halide.[C40] The method of producing a polymerizable compound containing amononuclear iridium complex according to [C37] above, wherein thecompound having a polymerizable functional group is an isocyanatecompound.[C41] A method of producing a polymerizable compound containing aniridium complex part, comprising reacting an iridium complex representedby the formula (C-10) with a compound having polymerizable functionalgroup in a predetermined molar ratio, and optionally reacting anunreacted reactive substituent, if any, of the obtained product with anunpolymerizable compound;

wherein X^(C) represents a reactive substituent, and R¹ to R²¹independently represent a hydrogen atom, a halogen atom, a nitro group,an amino group, a sulfonic acid group, a sulfonic acid ester group, oran organic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.[C42] The method of producing a polymerizable compound containing aniridium complex part according to [C41] above, wherein the molar ratioof the iridium complex represented by the formula (C-10) to the compoundhaving a polymerizable functional group is 1:(0.5 to 1.5).[C43] The method of producing a polymerizable compound containing aniridium complex part according to [C42] above, wherein the reactivesubstituent in the formula (C-10) is a hydroxyl group.[C44] The method of producing a polymerizable compound containing aniridium complex part according to [C43] above, wherein the compoundhaving a polymerizable functional group is an acid halide.[C45] The method of producing a polymerizable compound containing aniridium complex part according to [C43] above, wherein the compoundhaving a polymerizable functional group is an isocyanate compound.[C46] The method of producing a polymerizable compound containing aniridium complex part according to [C41] above, wherein the molar ratioof the iridium complex represented by the formula (C-10) to the compoundhaving a polymerizable functional group is 1:(1.5 to 2.5).[C47] The method of producing a polymerizable compound containing aniridium complex part according to [C46] above, wherein the reactivesubstituent in the formula (C-10) is a hydroxyl group.[C48] The method of producing a polymerizable compound containing aniridium complex part according to [C47] above, wherein the compoundhaving a polymerizable functional group is an acid halide.[C49] The method of producing a polymerizable compound containing aniridium complex part according to [C47] above, wherein the compoundhaving a polymerizable functional group is an isocyanate compound.[C50] The method of producing a polymerizable compound containing aniridium complex part according to [C41] above, wherein the molar ratioof the iridium complex represented by the formula (C-10) to the compoundhaving a polymerizable functional group is 1:(2.5 or more).[C51] The method of producing a polymerizable compound containing aniridium complex part according to [C50] above, wherein the reactivesubstituent in the formula (C-10) is a hydroxyl group.[C52] The method of producing a polymerizable compound containing aniridium complex part according to [C51] above, wherein the compoundhaving a polymerizable functional group is an acid halide.[C53] The method of producing a polymerizable compound containing aniridium complex part according to [C51] above, wherein the compoundhaving a polymerizable functional group is an isocyanate compound.[C54] A compound represented by the formula (C-11):

wherein at least one of X^(C), Y^(C), and Z^(C) represents a hydroxylgroup, and the remainder of X^(C), Y^(C), and Z^(C) independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms; and R¹ to R²¹ independently represent a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[C55] The compound according to [C54] above, wherein one of X^(C),Y^(C), and Z^(C) in the formula (C-11) is a hydroxyl group.[C56] A compound represented by the formula (C-12):

[C57] The compound according to [C54] above, wherein two of X^(C),Y^(C), and Z^(C) in the formula (C-11) are a hydroxyl group.[C58] A compound represented by the formula (C-13):

[C59] The compound according to [C54] above, wherein all of X^(C),Y^(C), and Z^(C) in the formula (C-11) are a hydroxyl group.[C60] A compound represented by the formula (C-14):

[D1] A polymerizable compound represented by the formula (D-1):

wherein at least one of X^(1D), Y^(1D), and Z^(1D) represents asubstituent having a polymerizable functional group, and the remainderof X^(1D), Y^(1D), and Z^(1D) independently represent a hydrogen atom,or an organic group having 1 to 20 carbon atoms which may have one ormore heteroatoms, and R¹ to R¹⁶ independently represent a hydrogen atom,a halogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[D2] The polymerizable compound according to [D1] above, wherein one ofX^(1D) or Z^(1D) in the formula (D-1) is a substituent having apolymerizable functional group.[D3] A polymerizable compound represented by the formula (D-2):

wherein X^(1D) represents a substituent having a polymerizablefunctional group, and Q^(1D) and Q^(2D) independently represent ahydrogen atom, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[D4] The polymerizable compound according to any one of [D1] to [D3]above, wherein the polymerizable functional group is a group having acarbon-carbon double bond.[D5] A polymerizable compound represented by the formula (D-3):

[D6] The polymerizable compound according to any one of [D1] to [D3]above, wherein the polymerizable functional group is a styryl group.[D7] A polymerizable compound represented by the formula (D-4):

[D8] The polymerizable compound according to any one of [D1] to [D3]above, wherein the polymerizable functional group is an acrylate groupor a methacrylate group.[D9] A polymerizable compound represented by the formula (D-5):

wherein R represents a hydrogen atom or a methyl group.[D10] A polymerizable compound represented by the formula (D-6):

wherein R represents a hydrogen atom or a methyl group.[D7] A polymerizable compound represented by the formula (D-7):

wherein R represents a hydrogen atom or a methyl group.[D12] A polymerizable compound represented by the formula (D-8):

wherein R represents a hydrogen atom or a methyl group.[D13] A polymerizable compound represented by the formula (D-9):

wherein R represents a hydrogen atom or a methyl group.[D14] A polymerizable compound represented by the formula (D-10):

wherein R represents a hydrogen atom or a methyl group.[D15] A polymerizable compound represented by the formula (D-11):

wherein R represents a hydrogen atom or a methyl group.[D16] A polymerizable compound represented by the formula (D-12):

wherein R represents a hydrogen atom or a methyl group.[D17] A polymerizable compound represented by the formula (D-13):

[D18] The polymerizable compound according to [D1] above, wherein Y^(1D)in the formula (D-1) is a substituent having a polymerizable functionalgroup.[D19] A polymerizable compound represented by the formula (D-14):

wherein Y^(1D) represents a substituent having a polymerizablefunctional group, and Q^(2D) and Q^(3D) independently represent ahydrogen atom, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[D20] The polymerizable compound according to [D18] or [D19] above,wherein the polymerizable functional group is a group having acarbon-carbon double bond.[D21] The polymerizable compound according to [D18] or [D19] above,wherein the polymerizable functional group is a styryl group.[D22] The polymerizable compound according to [D18] or [D19] above,wherein the polymerizable functional group is an acrylate group or amethacrylate group.[D23] A polymerizable compound represented by the formula (D-15):

wherein R represents a hydrogen atom or a methyl group.[D24] A polymerizable compound represented by the formula (D-16):

wherein R represents a hydrogen atom or a methyl group.[D25] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (D-17) with a compound havinga polymerizable functional group represented by the formula (D-18)below:

wherein R¹ to R³² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms;

wherein at least one of X^(1D), Y^(1D), and Z^(1D) represents asubstituent having a polymerizable functional group, and the remainderof X^(1D), Y^(1D), and Z^(1D) independently represent a hydrogen atom,or an organic group having 1 to 20 carbon atoms which may have one ormore heteroatoms.[D26] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [D25] above, whereinX^(1D) or Z^(1D) in the formula (D-18) is a substituent having apolymerizable functional group.[D27] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [D25] above, whereinY^(1D) in the formula (D-18) is a substituent having a polymerizablefunctional group.[D28] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (D-17) with a compound havinga polymerizable functional group represented by the formula (D-19) belowand then reacting a reactive substituent of the obtained mononucleariridium complex with a compound having a polymerizable functional group:

wherein R¹ to R³² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms;

wherein at least one of X^(2D), Y^(2D), and Z^(2D) represents asubstituent having a polymerizable functional group, and the remainderof X^(2D), Y^(2D), and Z^(2D) independently represent a hydrogen atom,or an organic group having 1 to 20 carbon atoms which may have one ormore heteroatoms.[D29] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [D28] above, whereinX^(2D) or Z^(2D) in the formula (D-19) is a substituent having ahydroxyl group.[D30] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [D28] above, whereinY^(2D) in the formula (D-19) is a substituent having a hydroxyl group.[D31] A compound represented by the formula (D-20):

wherein at least one of X^(2D), Y^(2D), and Z^(2D) represents asubstituent having a hydroxyl group, and the remainder of X^(2D),Y^(2D), and Z^(2D) independently represent a hydrogen atom, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms; and R¹ to R¹⁶ independently represent a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[D32] The compound according to [D31] above, wherein X^(2D) or Z^(2D) inthe formula (D-20) is a substituent having a hydroxyl group.[D33] A compound represented by the formula (D-21):

wherein n is 0 or an integer of 1 to 20, and Q^(1D) and Q^(2D)independently represent a hydrogen atom, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.[D34] A compound represented by the formula (D-22):

wherein n is 0 or an integer of 1 to 20, and Q^(1D) and Q^(2D)independently represent a hydrogen atom, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.[D35] The compound according to [D31] above, wherein Y^(2D) in theformula (D-20) is a substituent having a hydroxyl group.[D36] A compound represented by the formula (D-23):

wherein n is 0 or an integer of 1 to 20, and Q^(2D) and Q^(3D)independently represent a hydrogen atom, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.[D37] A polymer of the polymerizable compound according to any one of[D1] to [D24] above.[D38] A polymer obtained by polymerizing a composition containing atleast one of the polymerizable compounds according to [D1] to [D24]above.[E1] A polymerizable compound represented by the formula (E-1):

wherein X^(E) represents a substituent having a polymerizable functionalgroup; R^(1E), R^(2E) and R^(3E) independently represent a hydrogenatom, a halogen atom, or an organic group having 1 to 20 carbon atomswhich may have one or more heteroatoms; and R⁴ to R¹⁹ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[E2] The polymerizable compound according to [E1] above, wherein thepolymerizable functional group of X^(E) in the formula (E-1) is a grouphaving a carbon-carbon double bond.[E3] A polymerizable compound represented by the formula (E-2):

wherein X^(E) represents a substituent having a polymerizable functionalgroup.[E4] The polymerizable compound according to [E1] or [E3] above, whereinthe polymerizable functional group is an acryloyloxy group or amethacryloyloxy group.[E5] The polymerizable compound according to [E1] or [E3] above, whereinthe polymerizable functional group of X^(E) in the formula (E-1) or(E-2) is a methacryloyloxy group.[E6] A polymerizable compound represented by the formula (E-3):

[E7] The polymerizable compound according to [E1] or [E3] above, whereinthe polymerizable functional group of X^(E) in the formula (E-1) or(E-2) is a methacryloyloxymethyl group.[E8] A polymerizable compound represented by the formula (E-4):

[E9] The polymerizable compound according to [E1] or [E3] above, whereinthe polymerizable functional group of X^(E) in the formula (E-1) or(E-2) is a methacryloyloxyethyl-carbamoyloxymethyl group.[E10] A polymerizable compound represented by the formula (E-5):

[E11] The polymerizable compound according to [E1] or [E3] above,wherein the polymerizable functional group of X^(E) in the formula (E-1)or (E-2) is a methacryloyloxyethyloxycarbonyl group.[E12] A polymerizable compound represented by the formula (E-6):

[E13] The polymerizable compound according to [E1] or [E3] above,wherein the polymerizable functional group is a styryl group.[E14] The polymerizable compound according to [E1] or [E3] above,wherein the polymerizable functional group of X^(E) in the formula (E-1)or (E-2) is a vinylbenzyloxy group.[E15] A polymerizable compound represented by the formula (E-7):

[E16] A polymerizable compound represented by the formula (E-8):

[E17] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (E-9) with a picolinic acidderivative represented by the formula (E-10) and then reacting theobtained reaction product with a compound having both a polymerizablefunctional group and a functional group capable of reacting with andbonding the reactive substituent Y^(E) derived from a compoundrepresented by the formula (E-10) below:

wherein R⁴ to R¹⁹ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms;

wherein Y^(E) represents a reactive substituent; and R^(1E), R^(2E) andR^(3E) independently represent a hydrogen atom, a halogen atom, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.[E18] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E17] above, wherein Y^(E)in the formula (E-10) is a group having an active hydrogen.[E19] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E17] above, wherein Y^(E)in the formula (E-10) is a hydroxyl group or a hydroxymethyl group.[E20] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E19] above, wherein thecompound having both a polymerizable functional group and a functionalgroup capable of reacting with and bonding the reactive substituent yEis an acid chloride compound having a polymerizable functional group.[E21] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E19] above, wherein thecompound having both a polymerizable functional group and a functionalgroup capable of reacting with and bonding the reactive substituent yEis an alkyl halide compound having a polymerizable functional group.[E22] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E18] or [E19] above,wherein the compound having both a polymerizable functional group and afunctional group capable of reacting with and bonding the reactivesubstituent yE is an isocyanate compound having a polymerizablefunctional group.[E23] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E17] above, wherein Y^(E)in the formula (E-10) is a carboxyl group.[E24] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E23] above, wherein thecompound having both a polymerizable functional group and a functionalgroup capable of reacting with and bonding the reactive substituent yEis a compound having a hydroxyl group and a polymerizable functionalgroup.[E25] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (E-9) and a picolinic acidderivative represented by the formula (E-11):

wherein R⁴ to R¹⁹ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms;

wherein X^(E) represents a substituent having a polymerizable functionalgroup, and R^(1E), R^(2E) and R^(3E) independently represent a hydrogenatom, a halogen atom, or an organic group having 1 to 20 carbon atomswhich may have one or more heteroatoms.[E26] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [E25] above, wherein X^(E)in the formula (E-11) is any one member selected from the groupconsisting of a methacryloyloxy group, a methacryloyloxymethyl group, amethacryloyloxyethylcarbamoyloxymethyl group, amethacryloyloxyethyloxycarbonyl group, and a vinylbenzyloxy group.[E27] A compound represented by the formula (E-12):

wherein Y^(E) represents a reactive substituent, R^(1E), R^(2E) andR^(3E) independently represent a hydrogen atom, a halogen atom, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms, and R⁴ to R¹⁹ independently represent a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[E28] The compound according to [E27] above, wherein Y^(E) in theformula (E-12) is a hydroxyl group.[E29] A compound represented by the formula (E-13):

[E30] A compound represented by the formula (E-14):

[E31] A compound represented by the formula (E-15):

[E32] A polymerizable composition containing the polymerizable compoundaccording to any one of [E1] to [E16] above.[E33] A polymer of the polymerizable compound according to any one of[E1] to [E16].[E34] A polymer obtained by polymerizing the polymerizable compositionaccording to [E32] above.[F1] A polymerizable compound represented by the formula (F-1):

wherein at least one of X^(1F), Y^(1F), and Z^(1F) represents asubstituent having a polymerizable functional group, and the remainderof X^(1F), Y^(1F), and Z^(1F) independently represent a hydrogen atom, ahalogen atom, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms; and R¹ to R¹⁶ independently represent ahydrogen atom, a halogen atom, a nitro group, an amino group, a sulfonicacid group, a sulfonic acid ester group, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.[F2] The polymerizable compound according to [F1] above, wherein eitherone of X^(1F) and Z^(1F) is a substituent having a polymerizablefunctional group.[F3] A polymerizable compound represented by the formula (F-2):

wherein X^(1F) represents a substituent having a polymerizablefunctional group, and Q^(1F) and Q^(2F) independently represent ahydrogen atom, a halogen atom, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[F4] The polymerizable compound according to any one of [F1] to [F3]above, wherein the polymerizable functional group is a group having acarbon-carbon double bond.[F5] A polymerizable compound represented by the formula (F-3):

wherein n is 0 or an integer of 1 to 20.[F6] The polymerizable compound according to any one of [F1] to [F3]above, wherein the polymerizable functional group is a styryl group.[F7] A polymerizable compound represented by the formula (F-4):

wherein n is 0 or an integer of 1 to 20.[F8] A polymerizable compound represented by the formula (F-5):

[F9] The polymerizable compound according to any one of [F1] to [F3]above, wherein the polymerizable functional group is an alkenoyloxygroup.[F10] A polymerizable compound represented by the formula (F-6):

wherein n is 0 or an integer of 1 to 20, and A represents an organicgroup having 3 to 20 carbon atoms that has an acryloyl group, amethacryloyl group, an acryloyloxy group, or a methacryloyloxy group.[F11] A polymerizable compound represented by the formula (F-7):

wherein R represents a hydrogen atom or a methyl group.[F12] A polymerizable compound represented by the formula (F-8):

wherein R represents a hydrogen atom or a methyl group.[F13] A polymerizable compound represented by the formula (F-9):

wherein n is 0 or an integer of 1 to 20, and A represents an organicgroup having 3 to 20 carbon atoms that has an acryloyl group, amethacryloyl group, an acryloyloxy group, or a methacryloyloxy group.[F14] A polymerizable compound represented by the formula (F-10):

wherein R represents a hydrogen atom or a methyl group.[F15] A polymerizable compound represented by the formula (F-11):

wherein R represents a hydrogen atom or a methyl group.[F16] The polymerizable compound according to [F1], wherein Y^(1F) inthe formula (F-1) is a substituent having a polymerizable functionalgroup.[F17] A polymerizable compound represented by the formula (F-12):

wherein Y^(1F) represents a substituent having a polymerizablefunctional group, and Q^(2F) and Q^(3F) independently represent ahydrogen atom, a halogen atom, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.[F18] The polymerizable compound according to [F16] or [F17] above,wherein the polymerizable functional group is a group having acarbon-carbon double bond.[F19] The polymerizable compound according to [F16] or [F17] above,wherein the polymerizable functional group is a styryl group.[F20] The polymerizable compound according to [F16] or [F17] above,wherein the polymerizable functional group is an alkenoyloxy group.[F21] A polymerizable compound represented by the formula (F-13):

wherein R represents a hydrogen atom or a methyl group.[F22] A polymerizable compound represented by the formula (F-14):

wherein R represents a hydrogen atom or a methyl group.[F23] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (F-15) below with a compoundhaving a polymerizable functional group represented by the formula(F-16) below:

wherein R¹ to R¹⁶ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms;

wherein at least one of X^(1F), Y^(1F), and Z^(1F) represents asubstituent having a polymerizable functional group, and the remainderof X^(1F), Y^(1F), and Z^(1F) independently represent a hydrogen atom, ahalogen atom or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[F24] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [F23] above, whereinX^(1F) or Z^(1F) in the formula (F-16) is a substituent having apolymerizable functional group.[F25] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [F23] above, whereinY^(1F) in the formula (F-16) is a substituent having a polymerizablefunctional group.[F26] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (F-15) with a compound havinga reactive substituent represented by the formula (F-17) below, and thenreacting a reactive substituent of the obtained mononuclear iridiumcomplex with a compound having both a polymerizable functional group anda functional group capable of reacting with and bonding to a reactivefunctional substituent derived from the compound of the formula (F-17)(at least one of X^(2F), Y^(2F), and Z^(2F)):

wherein R¹ to R¹⁶ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

wherein at least one of X^(2F), Y^(2F), and Z^(2F) represents a reactivesubstituent, and the remainder of X^(2F), Y^(2F), and Z^(2F)independently represent a hydrogen atom, a halogen atom or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[F27] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [F26] above, whereinX^(E), Y^(E) or Z^(E) in the formula (F-17) is a substituent having anactive hydrogen.[F28] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [F26] above, whereinX^(2F) or Z^(2F) in the formula (F-17) is a substituent having ahydroxyl group.[F29] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [F26] above, whereinY^(2F) in the formula (F-17) is a substituent having a hydroxyl group.[F30] A compound represented by the formula (F-18):

wherein at least one of X^(2F), Y^(2F), and Z^(2F) represents asubstituent having a hydroxyl group, and the remainder of X^(2F),Y^(2F), and Z^(2F) independently represent a hydrogen atom, a halogenatom or an organic group having 1 to 20 carbon atoms which may have oneor more heteroatoms; and R¹ to R¹⁶ independently represent a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group, or an organic group having 1 to 20carbon atoms which may have one or more heteroatoms.[F31] The compound according to [F30] above, wherein X^(2F) or Z^(2F) inthe formula (F-18) is a substituent having a hydroxyl group.[F32] A compound represented by the formula (F-19):

wherein is 0 or an integer of 1 to 20, and Q^(1F) and Q^(2F)independently represent a hydrogen atom, a halogen atom, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[F33] A compound represented by the formula (F-20):

wherein is 0 or an integer of 1 to 20, and Q^(1F) and Q^(2F)independently represent a hydrogen atom, a halogen atom, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[F34] The compound according to [E30] above, wherein Y^(2F) in theformula (E-18) is a substituent having a hydroxyl group.[F35] A compound represented by the formula (F-21):

wherein n is 0 or an integer of 1 to 20, and Q^(2F) and Q^(3F)independently represent a hydrogen atom, a halogen atom, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[F36] A polymer of the polymerizable compound according to any one of[F1] to [F22] above.[F37] A polymer obtained by polymerizing a polymerizable compositioncontaining at least one of the polymerizable compounds according to [F1]to [F22] above.[F38] A polymerizable composition containing at least one of thepolymerizable compounds according to [F1] to [F22] above.[G1] A polymerizable compound represented by the formula (G-1):

wherein L represents a monovalent anionic bidentate ligand, X^(G)represents a substituent having a polymerizable functional group, and R¹to R⁷ independently represent a hydrogen atom, a halogen atom, a nitrogroup, an amino group, a sulfonic acid group, a sulfonic acid estergroup, or an organic group having 1 to 20 carbon atoms which may haveone or more heteroatoms.[G2] A polymerizable compound represented by the formula (G-2):

wherein A^(1G), A^(2G), and A^(3G) independently represent a hydrogenatom, a halogen atom or an organic group having 1 to 20 carbon atomswhich may have one or more heteroatoms; X^(G) represents a substituenthaving a polymerizable functional group, and R¹ to R⁷ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[G3] The polymerizable compound according to [G1] or [G2] above, whereinthe polymerizable functional group of XG in the formula (G-1) or (G-2)is a group having a carbon-carbon double bond.[G4] The polymerizable compound according to [G1] or [G2] above, whereinX^(G) in the formula (G-1) or (G-2) is any one of a methacryloyloxygroup, a methacryloyloxyethylcarbamoyloxy group, and a vinylbenzyloxygroup.[G5] A polymerizable compound represented by the formula (G-3):

[G6] A polymerizable compound represented by the formula (G-4):

[G7] A polymerizable compound represented by the formula (G-5):

[G8] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (G-6) with a monovalentanionic bidentate ligand L, and then reacting the reaction product witha compound having both a polymerizable functional group and a functionalgroup capable of reacting with and binding to the substituent yG havinga reactive functional group in the compound represented by the formula(G-6):

wherein Y^(G) is a substituent having a reactive functional group, andR¹ to R⁷ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[G9] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [G8] above, wherein Y^(G)in the formula (G-6) is a group having an active hydrogen.[G10] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [G8] above, wherein Y^(G)in the formula (G-6) is a substituent having a hydroxyl group.[G11] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [G10] above, wherein thecompound having both a polymerizable functional group and a functionalgroup capable of reacting with and binding to the substituent Y^(G)having a reactive group derived from the compound represented by theformula (G-6) is an acid halide compound having a polymerizablefunctional group or an alkyl halide compound having a polymerizablefunctional group.[G12] The method of producing a polymerizable compound containing amononuclear iridium complex part according to [G9] or [G10] above,wherein the compound having both a polymerizable functional group and afunctional group capable of reacting with and binding to the substituentY^(G) having a reactive group derived from the compound represented bythe formula (G-6) is an isocyanate compound having a polymerizablefunctional group.[G13] A method of producing a polymerizable compound containing amononuclear iridium complex part, comprising reacting a binucleariridium complex represented by the formula (G-7) below with a monovalentanionic bidentate ligand L:

wherein X^(G) is a substituent having a polymerizable functional group,and R¹ to R⁷ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[G14] A method of producing a polymerizable compound containing amononuclear iridium complex part according to [G13] above, wherein X^(G)in the formula (G-7) is any one of a methacryloyloxy group, amethacryloyloxyethylcarbamoyloxy group, and a vinylbenzyloxy group.[G15] A binuclear iridium complex represented by the formula (G-6):

wherein Y^(G) is a substituent having a reactive functional group, andR¹ to R⁷ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.[G16] The binuclear iridium complex according to [G15], wherein Y^(G) inthe formula (G-6) is a hydroxyl group.[G17] A binuclear iridium complex represented by the formula (G-8):

[G18] A compound represented by the formula (G-9):

wherein L represents a monovalent anionic bidentate ligand, Y^(G)represents a substituent having a reactive functional group, and R¹ toR⁷ independently represent a hydrogen atom, a halogen atom, a nitrogroup, an amino group, a sulfonic acid group, a sulfonic acid estergroup, or an organic group having 1 to 20 carbon atoms which may haveone or more heteroatoms.[G19] A compound represented by the formula (G-10):

wherein A^(1G), A^(2G), and A^(3G) independently represent a hydrogenatom, a halogen atom or an organic group having 1 to 20 carbon atomswhich may have one or more heteroatoms, Y^(G) represents a substituenthaving a reactive functional group, and R¹ to R¹⁷ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.[G20] The compound according to [G18] or [G19] above, wherein Y^(G) inthe formula (G-9) or (G-10) is a hydroxyl group.[G21] A compound represented by the formula (G-11):

[G22] A binuclear iridium complex represented by the formula (G-7):

wherein X^(G) represents a substituent having a polymerizable functionalgroup, and R¹ to R⁷ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.[G23] The binuclear iridium complex according to [G22] above, whereinX^(G) in the formula (G-7) is any one of a methacryloyloxy group, amethacryloyloxyethylcarbamoyloxy group, and a vinylbenzyloxy group.[G24] A composition containing the polymerizable compound according toany one of [G1] to [G7] above.[G25] A polymer of the polymerizable compound according to any one of[G1] to [G7] above.[G26] A polymer obtained by polymerizing a composition containing thepolymerizable compound according to any one of [G1] to [G7].

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 is a cross-sectional view showing an example of an organic lightemitting device of the present invention.

MODE OF THE INVENTION

Hereinafter, modes of the present invention will be described withreference to the attached drawing.

FIG. 1 is a cross-sectional view showing an example of the constructionof the organic light emitting device of the present invention, whichincludes a hole transport layer 3, a light emitting layer 4 and anelectron transport layer 5 provided in the order cited between an anode2 provided on a transparent substrate 1 and a cathode 6. Theconstruction of the organic light emitting device is not limited to theexample shown in FIG. 1 and may be one that has provided between theanode and the cathode in the order cited either (1) a hole transportlayer/a light emitting layer or (2) a light emitting layer/an electrontransport layer. Alternatively, the construction of the organic lightemitting device of the present invention may have only one layer fromany one of (3) a layer containing a hole transporting material, a lightemitting material and an electron transporting material, (4) a layercontaining a hole transporting material and a light emitting material,(5) a layer containing a light emitting material and an electrontransporting material, and (6) a layer containing only a light emittingmaterial. Furthermore, although the light emitting layer shown in FIG. 1consists of one layer, it may consist of two or more laminated layers.

In the present invention, the light emitting part means a part having amolecular structure that emits light from an excited triplet state,i.e., a phosphorescent emissive part, or a part having a molecularstructure that emits light through an excited triplet state(hereinafter, referred to as a “part emits light through an excitedtriplet state”). The light emitting parts are characterized byconstituting a part of a polymer or being bonded to a polymer. The partthat emits light through an excited triplet state ref ers to a systemthat consists of two constituent parts in which energy transfer occursfrom an excited triplet state of the constituent part corresponding tothe phosphorescent emissive, the first organic compound to an excitedtriplet state of the fluorescent emissive, the second organic compound,followed by fluorescent emission through the constituent partcorresponding to the second organic compound, as disclosed in JapanesePatent Application Laid-open No. 2002-050483.

In the case where the organic light emitting device of the presentinvention contains the part that emits through an excited triplet stateas described above, it is preferred that at least one of thephosphorescent emissive part and the fluorescent emissive partconstitutes a part of a polymer or is bonded to a polymer. In this case,the phosphorescent emissive part and/or fluorescent emissive part thatconstitutes a part of a polymer or is bonded to a polymer may form themain chain of the polymer or a side chain of the polymer (which means apendant group formed by a functional group or the like pending from themain chain but may also be a long chain branch).

The quantum efficiency of the phosphorescent emissive part in an excitedtriplet state is preferably 0.1 or more, more preferably 0.3 or more andparticularly preferably 0.5 or more. The compound having high quantumefficiency in an excited triplet state that can be used for thephosphorescent emissive part includes, for example, a metal complex andan organometallic compound. Specific examples of the metal complex andthe organometallic compound include transition metal complexes such asiridium complexes and platinum complexes, organometallic compoundscontaining a transition metal such as organometallic iridium compoundsand organometallic platinum compounds and derivatives thereof. Thesecomplexes are preferred in that they have relatively stable excitedtriplet states even at room temperatures. Further, they are preferredsince they can be readily obtained by coordinating a polymer having afunctional group capable of being coordinated to a transition metal atomas will be described later. Other compounds having high quantumefficiencies in an excited triplet state that can be used for thephosphorescent emissive part may be selected from the compoundsdescribed in, for example, “Handbook of Photochemistry, Second Edition(Steven L. Murov, et al., Marcel Dekker Inc., 1993).

The transition metals used for the above-mentioned transition metalcomplexes and organometallic compounds containing a transition metalinclude elements from Atomic No. 21, Sc, to Atomic No. 30, Zn in thefirst transient element series, from Atomic No. 39, Y to Atomic No. 48,Cd in the second transient element series, and from Atomic No. 72, Hf toAtomic No. 80, Hg, in the third transient element series of the periodictable.

Other specific examples of the metal complex and the organometalliccompound that emit through an excited triplet state include rare earthmetal complexes and organometallic compounds containing a rare earthmetal. The rare earth metals used for the rare earth metal complexes andthe organometallic compounds containing a rare earth metal includeelements from Atomic No. 57, La, to Atomic No. 71, Lu, in the periodictable.

In the present invention, the light emitting material means a lightemitting substance itself. In the present invention, the light emittingpart is a metal complex or the like, which is bonded to a polymer. Thatis, a light emitting substance is a polymer-in-itself, which is also alight emitting material. However, for the sake of explanation, the lightemitting part bonded to a polymer is in some cases referred to as alight emitting substance. In a broader sense, the term light emittingmaterial is used inclusive of those substances that constitute a lightemitting layer containing a light emitting substance, a binder, a holetransporting material and an electron transporting material.

In the present invention, the light emitting part is nonionic. This isbecause if the light emissive part is ionic, application of a voltage tothe light emitting layer containing the light emitting part results inthe occurrence of electrochemical luminescence, which has a responsespeed as slow as an order of minutes, so that it is not suitable forapplications to displays.

In the present invention, the expression “the light emitting partconstitutes a part of a polymer” means that the structure of a lightemitting part constitutes at least one repeating unit of a polymer. Inthe case where the polymer concerned is a copolymer, that expressionmeans that at least one constituent monomer has the structure of a lightemitting part. The light emitting part may constitute the main chain ofa polymer or a side chain (a pendant group or the like).

The expression “the light emitting part is bonded to a polymer” meansthat it is only required that the light emitting part is bonded to thepolymer compound regardless of the degree and form of bonding. Specificmethod of this bonding may include a method of incorporating the lightemitting part as a main chain of the polymer, a method of bonding thelight emitting part to the polymer as a side chain (including a pendantgroup) and the like. However, the present invention is not limitedthereto. In the case of the transition metal complexes and rare earthmetal complexes, mention may be made of a method of incorporating atleast one of the ligands that constitute the complex into the main chainof the polymer, a method of bonding at least one of ligands thatconstitute the complex into a side chain of the polymer and the like.

Examples of the ligand used for the above-mentioned transition metalcomplexes and rare earth metal complexes include acetylacetonato,2,2′-bipyridine, 4,4′-dimethyl-2′,2-bipyridine, 1,10-phenanthroline,2-phenylpyridine, porphyrin, phtalocyanine, pyrimidine, quinoline,2-benzothienylpyridine and/or derivatives thereof. However, the presentinvention is by no means limited thereto. One kind or plural kinds ofligands may be coordinated for a single complex. The above-mentionedcomplex compounds that can be used include a binuclear complex or apolynuclear complex or a double complex form composed of two or morekinds of complexes.

In the present invention, the metal atom that serves as a central metalof the metal complex structure used in the light emitting part is boundto at least one site of a polymer. The method of achieving this is notparticularly limited and includes various formations including complexformation through coordinate bonds, complex formation through chargetransfer, covalent bonds, ionic bonds, and the like. In this case, themethod of bonding ligands to a polymer to form a complex of a lightemitting substance is preferred since it can immobilize the ligands tothe polymer with a reduced change in the state of electron of the lightemitting substance. On this occasion, the method of binding ligands to apolymer to form a complex is particularly preferred since it is easy todesign and synthesize the material. In the case where the metal atomthat serves as the central metal is ion, a method of rendering the lightemitting part neutral is adopted for the reasons described above. Thismethod includes, for example, a method of forming an organometalliccompound having a coordinate bond together with a covalent bondsufficient for neutralizing the valence of the metal ion. However, thepresent invention is by no means limited thereto.

The polymer that immobilizes the metal atom in the present invention isnot particularly limited. For example, polymers having bound to the mainchain or side chain thereof a heterocyclic compound having capability ofcoordination, such as pyridine group, bipyridyl group, pyrimidine group,quinoline group, a phenylpyridine group or benzothienylpyridine groupmay be used. Specific examples of such a polymer include polymerscontaining ligands in the main chain and/or derivatives thereof, such aspoly(pyridinediyl), poly(bipyridinediyl), poly(quinolinediyl),poly(phenylpyridinediyl) and poly(benzothienylpyridinediyl), polymershaving ligands in the side chain thereof and/or derivatives thereof,such as poly(vinylpyridine), poly((meth)acrylpyridine),poly(vinylquinoline), poly(vinylphenylpyridine) andpoly(vinylbenzothienylpyridine), and/or polymers having combined theabove-mentioned structures, and the like.

The polymer that can be used in the present invention may be a copolymerof a monomer unit having a light emitting part that constitutes a partthereof or is bound thereto and a monomer unit having no light emittingpart. Examples of the monomer unit having no light emitting part includealkyl (meth)acrylates such as methyl acrylate and methyl methacrylate,styrene and derivatives thereof. However, the present invention is notlimited thereto.

The use of the copolymer containing a monomer unit having no lightemitting part as described above as a light emitting layer of an organiclight emitting device improves the processability of it and providesflexibility to the film after film formation. This is extremelyadvantageous in fabricating a flexible light emitting device using apolymer film substrate.

The polymer used in the present invention has a degree of polymerizationof preferably from 5 to 10,000 and more preferably from 10 to 5,000.

Since the molecular weight of the polymer depends on the molecularweight and degree of polymerization of the constituent monomer ormonomers, it is generally difficult to determine a suitable range ofmolecular weight of the polymer used in the present invention. However,usually, the molecular weight of the polymer used in the presentinvention has a weight average molecular weight of preferably from 1,000to 2,000,000 and more preferably from 5,000 to 1,000,000, independentlyof the above-mentioned degree of polymerization.

Here, the method of measuring molecular weight includes the methodsdescribed in “Koubunshi-Kagaku no Kiso (Basis of Polymer Chemistry)”(Tokyo Kagaku Dojin, 1978), that is, a GPC method (gel permeationchromatography), a method using osmotic pressure, a light scatteringmethod, an ultracentrifugation method and so forth.

In the organic light emitting device of the present invention, lightemission occurs by the following mechanism. That is, electric excitationgenerates 25% of the lowest excited singlet state and 75% of the lowestexcited triplet state. In the case of using a transition metal complexor a rare earth metal complex as a light emitting substance, theintersystem crossing from the lowest excited singlet state to the lowestexcited triplet state tends to occur due to the heavy atom effect, sothat the ratio of the lowest excited triplet state increases to morethan 75%. In the case of the transition metal complex, which emitsphosphorescence from the lowest excited triplet state, there existsnonradiative transition together with radiative transition that emitsphosphorescence. On the other hand, in the case of the rare earth metalcomplex, the excitation energy of the lowest excited triplet state ofthe ligand is transferred to the central metal ion and light emissionoccurs from the excitation level of the central metal ion. On thisoccasion, too, there exists nonradiative transition together withradiative transition that causes light emission. These nonradiativetransitions cannot be prevented from occurring unless low temperature aslow as the temperature of liquid nitrogen is used. Usually, lightemission of the above-mentioned compounds at room temperature isextremely weak.

However, in the organic light emitting device of the present invention,immobilization of the light emitting substance to the polymer on thelevel of molecules inhibits the vibration of molecules so that loss ofexcited energy in the form of vibration of molecules is prevented.Generally, the excited triplet states are deactivated with oxygen.However, in the organic light emitting device of the present invention,confinement of the light emitting substance in the polymer makes itpossible to prevent the invasion of oxygen.

The polymer light emitting material of the present invention can beprepared by polymerizing a polymerizable composition containing at leastone light emitting compound. The polymerizable composition as usedherein means a composition that contains a polymerizable compound havingat least one polymerizable functional group such as a (meth)acrylicgroup, a vinyl group, a styryl group, an isocyanate group, or athiocyanate group.

When the number of polymerizable functional groups in the polymerizablecompound is 1, the polymer after the polymerization has no crosslinkedstructure. When the number of polymerizable functional groups in thepolymerizable compound is 2 or more, the polymer after thepolymerization has a crosslinked structure. Since the crosslinkedpolymer is excellent in thermal stability, it is preferable that atleast one of the polymerizable compounds to be used is a crosslinkablecompound having two or more polymerizable functional groups.

In the present invention, the polymerizable compound in thepolymerizable composition used for the polymer light emitting materialmay be a light emitting compound having a polymerizable functionalgroup, an electron transporting compound having a polymerizablefunctional group, a hole transporting compound having a polymerizablefunctional group, or mixtures of these with other polymerizablecompounds. It is preferred that the light emitting compound used in thepresent invention is a light emitting compound having theabove-mentioned polymerizable functional group. In the case where thepolymerizable composition used for the polymer light emitting materialof the present invention contains a polymerizable compound other thanthe light emitting compound having a polymerizable functional group, thepolymer light emitting material of the present invention serves as acopolymer of the light emitting compound and other polymerizablecompound.

The light emitting part includes conjugated structures such as astilbene structure, transition metal complexes and the like. From theviewpoints of stability, freedom in design and the like, metal complexstructures are preferred.

The light emitting layer of the organic light emitting device of thepresent invention, which is a layer containing a light emittingsubstance bound to a polymer as a light emitting material, may containother light emitting material, a hole transporting material, an electrontransporting material and so forth.

Specifically, in order to further increase the carrier transportabilityof the phosphorescent emissive polymer compound of the presentinvention, the organic light emitting device of the present inventionmay use a composition containing the polymer compound of the presentinvention and a carrier transporting compound as a light emittingmaterial.

That is, a hole transporting compound and an electron transportingcompound may be mixed with the phosphorescent emissive polymer compoundof the present invention. When the phosphorescent emissive polymercompound of the present invention is hole transporting, it is preferredto mix an electron transporting compound therewith. On the contrary,when the phosphorescent emissive polymer compound of the presentinvention is an electron transporting, it is preferred to mix a holetransporting compound therewith. On this occasion, the hole transportingand the electron transporting compound may each be a low molecularweight compound or a polymer.

As the low molecular weight hole transporting compound to be blended inthe phosphorescent polymer compound of the present invention, known holetransporting materials including triphenylamine derivatives such as TPD(N,N′-diphenyl-N,N′-(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine), α-NPD(4,41-bis[N-(1-naphthyl)-N-phenylamino]biphenyl), and m-MTDATA(4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine) and carbazolederivatives such as CBP (4,4′-N,N′-dicarbazole-biphenyl) may be used.However, the present invention is not limited thereto.

The polymer hole transporting compound to be blended in thephosphorescent emissive polymer compound of the present inventioninclude in addition to poly(N-vinylcarbazole), polymer compoundsobtained by polymerizing monomers composed of the above-mentioned lowmolecular weight hole transporting compound, such as TPD, α-NPD,m-MTDATA, or CPD, to which a polymerizable functional group such as avinyl group, a styryl group, an acrylate group, or a methacrylate grouphas been introduced, polymer compounds having a triphenylamine skeletonas disclosed in Japanese Patent Application Laid-open No. 8-157575 andso forth. However, the present invention is by no means limited thereto.

On the other hand, as the low molecular weight electron transportingcompound to be blended in the phosphorescent polymer compound of thepresent invention, quinolinol derivative metal complexes such as Alq₃(trisaluminum quinolinol), oxadiazole derivatives such as PBD(2-biphenyl-4-yl-5-(4-tert-butylphenyl)-1,3,4-oxadiazole) and OXD-7(1,3-bis[5-(p-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]benzene, triazolederivatives such as TAZ(3-biphenyl-4-yl-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole),imidazole derivatives, triazine derivatives and so forth may be used.However, the present invention is by no means limited thereto.

The polymer electron transporting compound to be blended in thephosphorescent polymer compound of the present invention include inaddition to the poly PBD (compound obtained by polymerizing a monomercomposed of the PBD described above having introduced therein a vinylgroup) as disclosed in Japanese Patent Application Laid-open No.10-1665, compounds obtained by polymerizing monomers composed of the lowmolecular weight electron transporting compound such as theabove-mentioned Alq₃, OXD-7, or TAZ to which a polymerizable functionalgroup, such as a vinyl group, a styryl group, an acrylate group or amethacrylate group, has been introduced. However, the present inventionis by no means limited thereto.

The blending ratio of the low molecular weight hole transportingcompound and/or electron transporting compound to be blended with thephosphorescent emissive polymer compound of the present invention ispreferably from 0 to 100 mass %, more preferably from 10 to 70 mass %,and particularly preferably from 20 to 50 mass % based on thephosphorescent emissive polymer compound of the present invention.Further, the blending ratio of the high molecular weight holetransporting compound and/or electron transporting compound to beblended with the phosphorescent emissive compound of the presentinvention is preferably from 0 to 200 mass %, more preferably from 20 to150 mass %, and particularly preferably from 40 to 100 mass % based onthe phosphorescent emissive compound of the present invention.

For improving the physical properties and the like of the film obtainedby film formation, a composition obtained by blending the phosphorescentemissive polymer compound or composition of the present invention with apolymer compound that does not participate in the light emissioncharacteristics may also be used as a light emitting material. Forexample, to impart flexibility to the obtained film, PMMA (poly(methylmethacrylate)), polycarbonate, polystyrene and the like may be blended.However, the present invention is by no means limited thereto.

The blending ratio of the polymer compound that does not participate inthe light emission characteristics to be blended with the phosphorescentemissive polymer compound of the present invention is preferably from 0to 40 mass %, more preferably from 0 to 20 mass % and particularlypreferably from 0 to 10 mass %.

Specific examples of the polymerizable light emitting compound used inthe present invention include metal complexes having introduced thereinpolymerizable functional groups as represented by the following formulae(C-1), (D-1), (E-1), (F-1) and (G-1), respectively.

In the formula (C-1), at least one of A^(C), B^(C), and C^(C) representsa substituent having a polymerizable functional group, and the remainderof A^(C), B^(C), and C^(C) independently represent a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms. R¹ to R²¹ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.

In the formula (D-1), at least one of X^(1D), Y^(1D), and Z^(1D)represents a substituent having a polymerizable functional group, andthe remainder of X^(1D), Y^(1D), and Z^(1D) independently represent ahydrogen atom, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms. R¹ to R¹⁶ independently represent ahydrogen atom, a halogen atom, a nitro group, an amino group, a sulfonicacid group, a sulfonic acid ester group, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.

In the formula (E-1), X^(E) represents a substituent having apolymerizable functional group. R^(1E), R^(2E) and R^(3E) independentlyrepresent a hydrogen atom, a halogen atom, or an organic group having 1to 20 carbon atoms which may have one or more heteroatoms. R⁴ to R¹⁹independently represent a hydrogen atom, a halogen atom, a nitro group,an amino group, a sulfonic acid group, a sulfonic acid ester group, oran organic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.

In the formula (F-1), at least one of X^(1F), Y^(1F), and Z^(1F)represents a substituent having a polymerizable functional group, andthe remainder of X^(1F), Y^(1F), and Z^(1F) independently represent ahydrogen atom, a halogen atom, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms. R¹ to R¹⁶ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.

In the formula (D-1), L represents a monovalent anionic bidentateligand, X^(G) represents a substituent having a polymerizable functionalgroup, and R¹ to R⁷ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

Hereinafter, the polymerizable compounds of the formulae (C-1) to (G-1)will be described in detail.

Polymerizable Compound (C-1)

The substituent having a polymerizable functional group represented byA^(C), B^(C) and C^(C) in the formula (C-1) includes substituents havinga vinyl group, an acrylate group, a methacrylate group, a urethane(meth)acrylate group such as a methacryloyloxyethylcarbamate group, astyryl group and its derivatives, a vinyl amide group and itsderivative, respectively. Among these polymerizable functional groups,an acrylate group, a methacrylate group and a urethane (meth)acrylategroup are preferred from the viewpoint of polymerizability. The positionto which these substituents are bonded may be any one of the 2-, 3-, 4-and 5-positions of the phenyl group of the phenylpyridine ligand.

In the formulae (C-1) to (C-5) and (C-8) to (C-11), the expression“organic group having 1 to 20 carbon atoms which may have one or moreheteroatoms” is not particularly limited as far as it is not detrimentalto the purpose of the present invention. Preferred examples of suchorganic group include an alkyl group, an alkoxy group, an alkoxyalkylgroup, an aryl group, an aryloxy group, an aralkyl group or an aralkoxygroup having 1 to 20 carbon atoms and halogen-substituted derivativesthereof.

The substituents having no polymerizable functional group represented byA^(C), B^(C) and C^(C), and R¹ to R²¹ in the formula (C-1) include ahydrogen atom, a halogen atom, a nitro group, an amino group, a sulfonicacid group, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, alkoxy groups such as methoxy, ethoxy,propoxy, isobutoxy, and tert-butoxy, an acetoxy group, an ester groupsuch as propoxycarbonyl, and the like organic groups. These organicgroups may contain substituents such as a halogen atom, a nitro group,and an amino group.

Next, examples of the synthesis methods for the polymerizable compoundsof formula (C-1) will be presented below. However, the present inventionis by no means limited thereto.

A first synthesis method is a method of producing a polymerizablecompound containing a mononuclear iridium complex part by reacting abinuclear iridium complex represented by the formula (C-8) with aphenylpyridine derivative represented by the formula (C-9) to obtain amononuclear iridium complex having a reactive substituent as anintermediate, and then reacting the reactive substituent of theintermediate with a compound having a polymerizable functional group.

wherein X^(C) and Y^(C) independently represent a reactive substituent,or a hydrogen atom, a halogen atom, a nitro group, an amino group, asulfonic acid group, a sulfonic acid ester group, or an organic grouphaving 1 to 20 carbon atoms which may have one or more heteroatoms, andR¹ to R²⁸ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.

wherein Z^(C) represents a reactive substituent, or a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms, and R¹ to R⁷ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms, provided that at least one of X^(C) and Y^(C) in theformula (C-8) and Z^(C) in the formula (C-9) is a reactive substituent.

The binuclear iridium complex of the formula (C-8) can be synthesized bythe known method (S. Lamansky et al., Inorganic Chemistry, 40, 1704(2001)). Examples of R¹ to R²⁸ in the formula (C-8) include a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, alkoxy groups such as methoxy, ethoxy,propoxy, isobutoxy, and tert-butoxy, an acetoxy group, an ester groupsuch as propoxycarbonyl, and the like organic groups. These organicgroups may contain substituents such as a halogen atom, a nitro group,and an amino group.

At least one of X^(C) and Y^(C) in the formula (C-8) and Z^(C) in theformula (C-9) is a reactive substance, for example, a hydroxy group.However, the present invention is by no means limited thereto. Further,the reactive substituent may be protected with a protective group. Inthis case, the reaction is performed by using the complex or compoundhaving a protected reactive substituent as it is to obtain a mononucleariridium complex, which then is subjected to deprotection to obtain amononuclear iridium complex having a reactive substituent as anintermediate. Thereafter, the reactive substituent of the intermediateand a compound having a polymerizable functional group are reacted toobtain a polymerizable compound containing a mononuclear iridium complexpart. From the functional groups for the reactive substituents areexcluded the above-mentioned polymerizable functional groups.

Examples of R¹ to R⁷ in the compound of the formula (C-9) include ahydrogen atom, a halogen atom, a nitro group, an amino group, a sulfonicacid group, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, alkoxy groups such as methoxy, ethoxy,propoxy, isobutoxy, and tert-butoxy, an acetoxy group, an ester groupsuch as propoxycarbonyl, and the like organic groups. These organicgroups may contain substituents such as a halogen atom, a nitro group,and an amino group.

The polymerizable functional group in the compound having apolymerizable functional group to be reacted with the above-mentionedintermediate includes, for example, substituents having a vinyl group,an acrylate group, a methacrylate group, a urethane (meth)acrylate groupsuch as a methacryloyloxyethylcarbamate group, a styryl group and itsderivatives, a vinyl amide group and its derivative, respectively. Amongthese polymerizable functional groups, an acrylate group, a methacrylategroup and a urethane (meth)acrylate group are preferred from theviewpoint of polymerizability.

In the first synthesis method, when Xc and Yc in the binuclear iridiumcomplex of the formula (C-8) are nonreactive substituents and Z^(C) inthe phenylpyridine derivative of the formula (C-9) is a reactivesubstituent, a mononuclear iridium complex having a single reactivesubstituent is obtained as an intermediate by the reaction and furtherreaction of the intermediate with a compound having a polymerizablefunctional group can give rise to a monofunctional polymerizablecompound containing a mononuclear iridium complex part. Further, whenX^(C) and Y^(C) in the binuclear iridium complex of the formula (C-8)are reactive substituents and Z^(C) in the phenylpyridine derivative ofthe formula (C-9) is a nonreactive substituent, a mononuclear iridiumcomplex having two reactive substituents is obtained as an intermediateby these reactions and further reaction of the intermediate with acompound having a polymerizable functional group can give rise to abifunctional polymerizable compound containing a mononuclear iridiumcomplex part.

A second synthesis method for the polymerizable compound of formula(C-1) is a method of producing a polymerizable compound containing aniridium complex part having a predetermined number of polymerizablefunctional groups by reacting the iridium complex of the formula (C-10)as an intermediate with a compound having a polymerizable functionalgroup in a predetermined molar ratio.

wherein X^(C) represents a reactive substituent, and R¹ to R²¹independently represent a hydrogen atom, a halogen atom, a nitro group,an amino group, a sulfonic acid group, a sulfonic acid ester group, oran organic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.

The reactive substituent X^(C) in the iridium complex of the formula(C-10) includes, for example, a hydroxyl group and an amino group.However, the present invention is by no means limited thereto. On theother hand, the compound having a polymerizable functional group to bereacted with the iridium complex of the formula (C-10) includes, forexample, a polymerizable acid halide and a polymerizable isocyanate.However, the present invention is by no means limited thereto.

Next, the use of the second synthetic method in producing polymerizableacid halides and/or polymerizable isocyanates will be described indetail.

In the case where the molar ratio of the iridium complex of the formula(C-10) to the polymerizable acid halide and/or polymerizable isocyanateis close to 1:1, for example, 1:(0.5 to 1.5), a mixture composed mainlyof a monofunctional polymerizable compound can be obtained. Purificationof the product affords the monofunctional polymerizable compound. On theother hand, in the case where this molar ratio is close to 1:2, forexample, 1:(1.5 to 2.5), a mixture composed mainly of a bifunctionalpolymerizable compound can be obtained. Purification of the productaffords the bifunctional polymerizable compound. Further, in the casewhere the molar ratio is close to 1:3, for example, 1:(2.5 or more), amixture composed mainly of a trifunctional polymerizable compound can beobtained. Purification of the product affords the trifunctionalpolymerizable compound. However, when the above-mentioned molar ratio is1:(3 or more), purification for removing mono- and bifunctionalpolymerizable compounds is not always necessary. In the case where mono-and bifunctional polymerizable compounds are synthesized, apolymerizable acid halide is reacted in a predetermined molar ratio andthen a reaction for rendering the residual reactive substituentremaining in the product nonreactive is performed. In the case where thereactive substituent is a hydroxyl group, examples of theunpolymerizable compound used for this purpose include alkyl halides,carboxylic acids, carboxylic acid halides, sulfonic acid halides,chloroformates, isocyanates and the like. However, the present inventionis by no means limited thereto.

Examples of the polymerizable acid halide used in the second syntheticmethod include acrylic acid chloride, methacrylic acid chloride and thelike. Examples of the unpolymerizable acid halide include propionic acidchloride, acetic acid chloride and the like. Examples of thepolymerizable isocyanate include methacryloyl isocyanate,methacryloyloxyethyl isocyanate and the like. Unpolymerizable isocyanateincludes, for example, hexyl isocyanate, benzyl isocyanate and the like.

Still another synthetic method for the polymerizable compound of formula(C-1) includes, for example, a method of producing a monofunctionalpolymerizable compound containing an iridium complex part by reactingiridium (III) bis(2-phenylpyridinato)acetylacetonato complex with thephenylpyridine derivative of the formula (C-9) having a reactivesubstituent and then introducing to the product a polymerizablesubstituent.

The polymer and copolymer of the present invention has a degree ofpolymerization of preferably from 3 to 5,000.

Polymerizable Compound (D-1)

In the substituent having a polymerizable functional group representedby X^(1D), Y^(1D) and Z^(1D) in the formula (D-1), a polymerizablefunctional group may be any of a radical polymerizable group, a cationpolymerizable group, an anion polymerizable group, an additionpolymerizable group, and a condensation polymerizable group. Amongthese, a radical polymerizable functional group is preferred. Examplesof the polymerizable functional group include a vinyl group, an allylgroup, an alkenyl group, an acrylate group, a methacrylate group, aurethane (meth)acrylate group such as methacryloyloxyethyl carbamate, astyryl group and derivatives thereof, a vinyl amide group andderivatives thereof. Among the polymerizable functional groups, anacrylate group, a methacrylate group and a urethane (meth)acrylate groupare preferred from the viewpoint of polymerizability.

In the formulae (D-1), (D-2), (D-14) and (D-17) to (D-23), theexpression “organic group having 1 to carbon atoms which may have one ormore heteroatoms” is not particularly limited as far as it is notdetrimental to the purpose of the present invention. Preferred examplesof such organic group include an alkyl group, an alkoxy group, analkoxyalkyl group, an aryl group, an aryloxy group, an aralkyl group oran aralkoxy group having 1 to 20 carbon atoms and halogen-substitutedderivatives thereof.

In the formulae (D-1), (D-2), (D-14) and (D-18) to (D-23), examples ofthe substituents having no polymerizable functional group represented byQ^(1D), Q^(2D) and Q^(3D) out of X^(1D), Y^(1D) and Z^(1D), and Q^(1D)to Q^(3D) include a hydrogen atom, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anacetoxy group, an ester group such as propoxycarbonyl, an aryl group,and the like organic groups.

In the formulae (D-1), (D-17) and (D-20), examples of R¹ to R¹⁶ and R¹⁷to R³² in each formula include a hydrogen atom, a halogen atom, a nitrogroup, an amino group, a sulfonic acid group, a sulfonic acid estergroup such as methyl sulfonate, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anacetoxy group, an ester group such as propoxycarbonyl, an aryl group,and the like organic groups. These organic groups may containsubstituents such as a halogen atom, a nitro group, and an amino group.

Next, examples of the synthetic method for the polymerizable compound offormula (D-1) will be described. However, the present invention is by nomeans limited thereto.

A first synthetic method is a method of producing a polymerizablecompound containing a mononuclear iridium complex part by reacting abinuclear iridium complex represented by the formula (D-17) with acompound having a polymerizable functional group represented by theformula: (D-18) below.

wherein R¹ to R³² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

wherein at least one of X^(1D), Y^(1D), and Z^(1D) represents asubstituent having a polymerizable functional group, and the remainderof X^(1D), Y^(1D), and Z^(1D) independently represent a hydrogen atom,or an organic group having 1 to 20 carbon atoms which may have one ormore heteroatoms.

The binuclear iridium complex of the formula (D-17) can be synthesizedby the known method (S. Lamansky et al., Inorganic Chemistry, 40, 1704(2001)). Examples of R¹ to R³² in the formula (D-17) include a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, alkoxy groups such as methoxy, ethoxy,propoxy, isobutoxy, and tert-butoxy, an acetoxy group, an ester groupsuch as propoxycarbonyl, and the like organic groups. These organicgroups may contain substituents such as a halogen atom, a nitro group,and an amino group.

At least one of the substituents X^(1D), Y^(1D) and Z^(1D) of thecompound of the formula (D-18) is a substituent having polymerizablefunctional group and means the same group as explained on the formula(D-1). The substituent having no polymerizable functional groups out ofthe substituents represented by the substituents X^(1D), Y^(1D) andZ^(1D) of the compound of the formula (D-18) are the same as the formula(D-1).

A second synthesis method for the polymerizable compound of formula(D-1) is a method of producing a polymerizable compound containing amononuclear iridium complex part by reacting a binuclear iridium complexrepresented by the formula (D-17) with a compound having a reactivesubstituent represented by the formula (D-19) below to obtain amononuclear iridium complex having a reactive substituent as anintermediate, and then reacting the reactive substituent of the obtainedmononuclear iridium complex with a compound having a polymerizablefunctional group.

wherein R¹ to R³² independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

wherein at least one of X^(2D), Y^(2D), and Z^(2D) represents a reactivesubstituent, and the remainder of X^(2D), Y^(2D), and Z^(2D)independently represent a hydrogen atom, or an organic group having 1 to20 carbon atoms which may have one or more heteroatoms.

At least one of the substituents X^(2D), Y^(2D) and Z^(2D) of thecompound of the formula (D-19) is a reactive substituent having afunctional group, for example, a hydroxyl group. Examples of thefunctional group may include a hydroxyl group, an amino group and acarboxyl group. However, the present invention is by no means limitedthereto. The reactive substituent having a functional group includes ahydroxyl group, a hydroxyalkyl group, a hydroxyphenyl group and thelike.

Further, the reactive substituent may be protected with a protectivegroup. In this case, the reaction is performed by using the complex orcompound having a protected reactive substituent, as it is to obtain amononuclear iridium complex, which then is subjected to deprotection toobtain a mononuclear iridium complex having a reactive substituent as anintermediate. Thereafter, the reactive substituent of the intermediateand a compound having a polymerizable functional group are reacted toobtain a polymerizable compound containing a mononuclear iridium complexpart. From the functional groups for the reactive substituents areexcluded the above-mentioned polymerizable functional groups.

Examples of the substituents having no polymerizable functional grouprepresented by X^(2D), Y^(2D) and Z^(2D) in the formula (D-19) include ahydrogen atom, a halogen atom, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anacetoxy group, an ester group such as propoxycarbonyl, an aryl group,and the like organic groups. These organic groups may have a substituentsuch as a halogen atom.

The compound having a polymerizable functional group to be reacted withthe mononuclear iridium complex having a reactive substituent obtainedby the reaction between the binuclear iridium complex and the compoundof the formula (D-19) having a reactive substituent must have inaddition to the polymerizable group a functional group having a groupreactive with the reactive substituents X^(2D), Y^(2D) and Y^(3D) in theformula (D-19). In the case of the second synthesis method for thepolymerizable compounds according to the present invention, R¹ to R³² inthe formula (D-17) must be selected so as to be groups that do not reactwith the compound having a polymerizable functional group to be reactedwith the above-mentioned mononuclear iridium complex.

Examples of the compound having a polymerizable functional group to bereacted with the above-mentioned mononuclear iridium complex includepolymerizable acid chlorides and polymerizable isocyanates. However, thepresent invention is by no means limited thereto. The polymerizablefunctional group may be any of a radical polymerizable group, a cationpolymerizable group, an anion polymerizable group, an additionpolymerizable group, and a condensation polymerizable group. Amongthese, a radical polymerizable functional group is preferred. Examplesof the polymerizable functional group include a vinyl group, an allylgroup, an alkenyl group, an acrylate group, a methacrylate group, aurethane (meth)acrylate group such as methacryloyloxyethyl carbamate, astyryl group and derivatives thereof, a vinyl amide group andderivatives thereof. Among the polymerizable functional groups, anacrylate group, a methacrylate group and a urethane (meth)acrylate groupare preferred from the viewpoint of polymerizability. Specifically,examples of the polymerizable acid chloride include acrylic acidchloride, methacrylic acid chloride and the like. Examples of thepolymerizable isocyanate include methacryloyl isocyanate andmethacryloyloxyethyl isocyanate and the like.

The chemical formulae such as the formula (D-1) representing thecompounds of the present invention represent metal complex structures,in which O—C—C—C—O indicates resonant structures. Of course they includechemically acceptable structures.

Polymerizable Compound (E-1)

The substituent having a polymerizable functional group represented byX^(E) in the formula (E-1) is preferably a substituent having acarbon-carbon double bond as a polymerizable functional group, examplesof which include substituents having a vinyl group, an acryloyloxygroup, a methacryloyloxy group, a urethane (meth)acryloyloxy group, suchas a methacryloyloxyethylcarbamate group, a styryl group and itsderivatives, and a vinyl amide group and its derivative, respectively.Among these polymerizable functional groups, an acryloyloxy group, amethacryloyloxy group, a urethane (meth) acryloyloxy group, and a styrylgroup are preferred from the viewpoint of polymerizability. The positionto which these substituents are bonded may be any one of the 3-, 4-, 5-and 6-positions of the picolinic acid ligand.

In the formulae (E-1), and (E-9) to (E-12), the expression “organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms” is not particularly limited as far as it is not detrimentalto the purpose of the present invention. Preferred examples of suchorganic group include an alkyl group, an alkoxy group, an alkoxyalkylgroup, an aryl group, an aryloxy group, an aralkyl group or an aralkoxygroup having 1 to 20 carbon atoms and halogen-substituted derivativesthereof.

Examples of R^(1E), R^(2E) and R^(3E) in the formulae (E-1) include ahydrogen atom, a halogen atom, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anaralkyl group, an acetoxy group, an ester group such as propoxycarbonyl,and the like organic groups. These substituents may further have asubstituent such as a halogen atom.

Examples of R⁴ to R¹⁹ in the formula (E-1) include a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group such as methyl sulfonate, alkyl groups such asmethyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, andhexyl, alkoxy groups such as methoxy, ethoxy, propoxy, isobutoxy, andtert-butoxy, an aralkyl group, an acetoxy group, an ester group such aspropoxycarbonyl, and the like organic groups. These organic groups mayfurther have substituents such as a halogen atom, a nitro group, and anamino group. Among these, a hydrogen atom, a halogen atom and alkylgroups having 1 to 20 carbon atoms are preferred.

Next, examples of the synthesis methods for the polymerizable compoundof the formula (E-1) will be presented below. However, the presentinvention is by no means limited thereto.

A first synthesis method for the polymerizable compound of the formula(E-1) is a method of producing a polymerizable compound containing amononuclear iridium complex part by reacting a binuclear iridium complexrepresented by the formula (E-9) with a picolinic acid derivativerepresented by the formula (E-10) to obtain a mononuclear iridiumcomplex having a reactive substituent as an intermediate, and thenreacting the reactive substituent of the intermediate with a compoundhaving a polymerizable functional group.

wherein R⁴ to R¹⁹ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

wherein Y^(E) represents a reactive substituent. R^(1E), R^(2E) andR^(3E) independently represent a hydrogen atom, a halogen atom, or anorganic group having 1 to 20 carbon atoms which may have one or moreheteroatoms.

The binuclear iridium complex of the formula (E-9) can be synthesized bythe known method (S. Lamansky et al., Inorganic Chemistry, 40, 1704(2001)) Examples of R⁴ to R¹⁹ in the formula (E-9) include a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, alkoxy groups such as methoxy, ethoxy,propoxy, isobutoxy, and tert-butoxy, an aralkyl group, an acetoxy group,an ester group such as propoxycarbonyl, and the like organic groups.These organic groups may contain substituents such as a halogen atom, anitro group, and an amino group. Among these, a hydrogen atom, a halogenatom and alkyl groups having 1 to 20 carbon atoms are preferred.

The Y^(E) in the formula (E-10) is a reactive substituent, examples ofwhich include groups having an active hydrogen such as a hydroxymethylgroup, a hydroxyl group, a mercapto group and an amino group,respectively, and a carboxyl group. However, the present invention is byno means limited thereto. Further, the reactive substituent may beprotected with a protective group. In this case, the reaction isperformed as it is, i.e., in a state where the reactive substituent isprotected with a protecting group to obtain a mononuclear iridiumcomplex, which then is subjected to deprotection to obtain a mononucleariridium complex having a reactive substituent as an intermediate.Thereafter, the reactive substituent of the intermediate and a compoundhaving a polymerizable functional group are reacted to obtain apolymerizable compound containing a mononuclear iridium complex part.From the functional groups for the reactive substituents are to beexcluded the above-mentioned polymerizable functional groups.

Examples of R^(1E), R^(2E) and R^(3E) in the formula (E-10) include ahydrogen atom, a halogen atom, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anaralkyl group, an acetoxy group, an ester group such as propoxycarbonyl,and the like organic groups. These organic groups may further containsubstituents such as a halogen atom. Among these, a hydrogen atom, ahalogen atom and alkyl groups having 1 to 20 carbon atoms are preferred.

The compound having a polymerizable functional group to be reacted withthe mononuclear iridium complex having a reactive substituent(intermediate) obtained by the reaction between the binuclear iridiumcomplex of the formula (E-9) and the compound of the formula (E-10)having a reactive substituent must have in addition to the polymerizablegroup a functional group having a group reactive with the reactivesubstituent yE in the formula (E-10). Examples of such a functionalgroup include an isocyanato group and a carboxyl group when the reactivesubstituent Y^(E) is a hydroxymethyl group or a hydroxyl group, or anisocyanato group and an acid chloride (R—COCl) group when the reactivesubstituent Y^(E) is a mercapto group or an amino group. On the otherhand, R⁴ to R¹⁹ in the formula (E-9) must be selected from groups thatdo not react with the compound having a polymerizable functional groupto be reacted with the above-mentioned mononuclear iridium complex.

The polymerizable functional group in the compound having apolymerizable functional group to be reacted with the above-mentionedintermediate is preferably a group having a carbon-carbon double bond asa polymerizable functional group, examples of which include a vinylgroup, an acryloyloxy group, a methacryloyloxy group, a urethane(meth)acryloyloxy group, such as a methacryloyloxyethylcarbamate group,a styryl group and its derivatives, a vinyl amide group and itsderivative, respectively. Among these polymerizable functional groups,an acryloyloxy group, a methacryloyloxy group, a urethane (meth)acryloyloxy group, and a styryl group are preferred from the viewpointof polymerizability.

The second synthesis method for the polymerizable compound of theformula (E-1) is a method of directly producing a polymerizable compoundcontaining a mononuclear iridium complex part by reacting a binucleariridium complex of the formula (E-9) with a picolinic acid derivative ofthe formula (E-11):

wherein X^(E) represents a substituent having a polymerizable functionalgroup, and R^(1E), R^(2E) and R^(3E) independently represent a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group, or an organic group having 1 to 20carbon atoms which may have one or more heteroatoms.

The X^(E) in the formula (E-11), which is a substituent having apolymerizable functional group, is preferably a substituent having acarbon-carbon double bond as a polymerizable functional group. Examplesthereof include a methacryloyloxy group, amethacryloyloxyethylcarbamoyloxy group, amethacryloyloxyethylcarbamoyloxymethyl group, a vinylbenzyloxy group, amethacryloyloxyethyloxycarbonyl group and the like. However, the presentinvention is by no means limited thereto.

Examples of R^(1E), R^(2E) and R^(3E) in the formula (E-11) include ahydrogen atom, a halogen atom, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anaralkyl group, an acetoxy group, an ester group such as propoxycarbonyl,and the like organic groups. These organic groups may further containsubstituents such as a halogen atom.

Polymerizable Compound (F-1)

In the substituent having a polymerizable functional group representedby X^(1F), Y^(1F) and Z^(1F) in the formula (F-1), a polymerizablefunctional group may be any of a radical polymerizable group, a cationpolymerizable group, an anion polymerizable group, an additionpolymerizable group, and a condensation polymerizable group. Amongthese, a radical polymerizable functional group is preferred. Examplesof the polymerizable functional group include those groups having avinyl group, an allyl group, an alkenyl group, an alkenoyloxy group suchas an acryloyloxy group and a methacryloyloxy group, a urethane (meth)acryloyloxy group such as a methacryloyloxyethylcarbamate group, astyryl group and its derivatives, a vinyl amide group and itsderivatives, respectively. Among these polymerizable functional groups,an acryloyloxy group, a methacryloyloxy group, a urethane(meth)acryloyloxy group, and a styryl group are preferred from theviewpoint of polymerizability.

In the formulae (F-1), (F-2), (F-12), and (F-15) to (F-21), the “organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms” is not particularly limited as far as it is not detrimentalto the purpose of the present invention and may have a heteroatom suchas an oxygen atom, a nitrogen atom, a sulfur atom or a halogen atom.Preferred examples of such an organic group include an alkyl group, analkoxy group, an alkoxyalkyl group, an aryl group, an aryloxy group, anaralkyl group or an aralkoxy group having 1 to 20 carbon atoms andhalogen-substituted derivatives thereof.

Examples of the substituents having no polymerizable functional grouprepresented by Q^(1F), Q^(2F) and Q^(3F) out of X^(1F), Y^(1F) andZ^(1F) in the formulae (F-1), (F-2), (F-12), and (F-15) to (F-21),include a hydrogen atom, a halogen atom, alkyl groups such as methyl,ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl,an aralkyl group, alkoxy groups such as methoxy, ethoxy, propoxy,isobutoxy, and tert-butoxy, an acetoxy group, an ester group such aspropoxycarbonyl, an aryl group, and the like organic groups. Amongthese, a hydrogen atom, a halogen atom, and alkyl groups having 1 to 20carbon atoms are preferred.

The R¹ to R¹⁶ in the formulae (F-1), (F-15) and (F-18) include ahydrogen atom, a halogen atom, a nitro group, an amino group, a sulfonicacid group, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, an aralkyl group, alkoxy groups such asmethoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, an acetoxy group,an ester group such as propoxycarbonyl, an aryl group, and the likeorganic groups, provided that they fall in the range as defined above.These organic groups may further have substituents such as a halogenatom, a nitro group, and an amino group. Among these, a hydrogen atom, ahalogen atom, and alkyl groups having 1 to 20 carbon atoms arepreferred.

“A”s in the formula (F-6) and (F-9) are organic groups having 3 to 20carbon atoms, containing an acryloyl group, a methacryloyl group, anacryloyloxy group or a methacryloyloxy group. The organic groups mayhave a heteroatom such as an oxygen atom, a nitrogen atom, a sulfuratom, or a halogen atom as far as it is not detrimental to the purposeof the present invention. Preferred examples of such an organic groupinclude an alkyl group, an aryl group and an aralkyl group. Further,these groups may contain an isocyanate bond.

Next, examples of the synthesis methods for the polymerizable compoundin the formula (F-1) will be presented below. However, the presentinvention is by no means limited thereto.

A first synthesis method is a method of producing a polymerizablecompound containing a mononuclear iridium complex part by reacting abinuclear iridium complex represented by the formula (F-15) with acompound having a polymerizable functional group represented by theformula (F-16):

wherein R¹ to R¹⁶ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

wherein at least one of X^(1F), Y^(1F), and Z^(1F) represents asubstituent having a polymerizable functional group, and the remainderof X^(1F), Y^(1F), and Z^(1F) independently represent a hydrogen atom, ahalogen atom or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.

The binuclear iridium complex of the formula (F-15) can be synthesizedby the known method (S. Lamansky et al., Inorganic Chemistry, 40, 1704(2001)). Examples of R¹ to R¹⁶ in the formula (F-15) include a hydrogenatom, a halogen atom, a nitro group, an amino group, a sulfonic acidgroup, a sulfonic acid ester group such as methyl sulfonate, alkylgroups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl,tert-butyl, amyl, and hexyl, an aralkyl group such as a benzyl group,alkoxy groups such as methoxy, ethoxy, propoxy, isobutoxy, andtert-butoxy, an acetoxy group, an ester group such as propoxycarbonyl,and the like organic groups. These organic groups may further containsubstituents such as a halogen atom, a nitro group, and an amino group.Among these, a hydrogen atom, a halogen atom, and alkyl groups having 1to 20 carbon atoms are preferred.

At least one of the substituents X^(1F), Y^(1F) and Z^(1F) of thecompound of the formula (F-16) is a substituent having polymerizablefunctional group and has the same meaning as explained on the formula(F-1). The substituent having no polymerizable functional grouprepresented by the substituents X^(1F), Y^(1F) and Z^(1F) of thecompound of the formula (F-16) are the same as in the case of theformula (F-1).

A second synthesis method for the polymerizable compound of formula(F-1) is a method of producing a polymerizable compound containing amononuclear iridium complex part by reacting a binuclear iridium complexrepresented by the formula (F-15) with a compound having a reactivesubstituent represented by the formula (F-17) to obtain a mononucleariridium complex having a reactive substituent as an intermediate, andthen reacting the reactive substituent of the intermediate with acompound having a polymerizable functional group:

wherein R¹ to R¹⁶ independently represent a hydrogen atom, a halogenatom, a nitro group, an amino group, a sulfonic acid group, a sulfonicacid ester group, or an organic group having 1 to 20 carbon atoms whichmay have one or more heteroatoms.

wherein at least one of X^(2F), Y^(2F), and Z^(2F) represents a reactivesubstituent, and the remainder of X^(2F), Y^(2F), and Z^(2F)independently represent a hydrogen atom, a halogen atom or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.

At least one of the substituents X^(2F), Y^(2F) and Z^(2F) of theformula (F-17) is a reactive substituent having a functional group, forexample, a hydroxyl group. Examples of the functional group may includean active hydrogen, such as a hydroxyl group, a mercapto group, and anamino group, and a carboxyl group. However, the present invention is byno means limited thereto. Examples of the reactive substituent having afunctional group include a hydroxyl group, a hydroxyalkyl group, ahydroxyphenyl group, a mercapto group, an amino group and the like.

Further, the reactive substituent may be protected with a protectivegroup. In this case, the reaction is performed as it is, i.e., in astate where the reactive substituent is protected with a protectivegroup to obtain a mononuclear iridium complex, which then is subjectedto deprotection to obtain a mononuclear iridium complex having areactive substituent as an intermediate. Thereafter, the reactivesubstituent of the intermediate and a compound having a polymerizablefunctional group are reacted to obtain a polymerizable compoundcontaining a mononuclear iridium complex part. From the functionalgroups for the reactive substituents are to be excluded theabove-mentioned polymerizable functional groups.

The substituents out of the substituents X^(2F), Y^(2F) and Z^(2F) ofthe compound of the formula (F-19) other than the reactive substituentsinclude a hydrogen atom, a halogen atom, alkyl groups such as methyl,ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl,alkoxy groups such as methoxy, ethoxy, propoxy, isobutoxy, andtert-butoxy, an acetoxy group, an ester group such as propoxycarbonyl,an aryl group, and the like organic groups. These substituents mayfurther have a substituent such as a halogen atom.

The compound having a polymerizable functional group to be reacted withthe mononuclear iridium complex having a reactive substituent obtainedby the reaction between the binuclear iridium complex and the compoundof the formula (F-17) having a reactive substituent must have inaddition to the polymerizable group a functional group having a groupreactive with the reactive substituent X^(2F), Y^(2F), and Z^(2F) in theformula (F-17). Examples of such a functional group include anisocyanato group and a carboxyl group when the reactive substituentsX^(2F), Y^(2F) or Z^(2F) are groups that contain a hydroxyl group, suchas a hydroxymethyl group or a hydroxyl group, or an isocyanato group andan acid chloride (R—COCl) group when the reactive substituents X^(2F),Y^(2F) or Z^(2F) are groups that contain a mercapto group or an aminogroup, or a hydroxyl group when the reactive substituents X^(2F), Y^(2F)or Z^(2F) are groups that contain a carboxyl group.

In the case of the second synthesis method for the polymerizablecompound of formula (F-1), R¹ to R¹⁶ in the formula (F-15) must beselected from groups that do not react with the compound having apolymerizable functional group to be reacted with the above-mentionedmononuclear iridium complex.

Examples of the compound having a polymerizable functional group to bereacted with the above-mentioned mononuclear iridium complex includepolymerizable acid chlorides and polymerizable isocyanates. However, thepresent invention is by no means limited thereto. In these compounds,the polymerizable functional group may be any of a radical polymerizablegroup, a cation polymerizable group, an anion polymerizable group, anaddition polymerizable group, and a condensation polymerizable group.Among these, a radical polymerizable functional group is preferred. Thepolymerizable functional group is preferably a group having acarbon-carbon double bond. Examples thereof include a vinyl group, anallyl group, an alkenyl group, an alkenoyloxy group such as anacryloyloxy group and a methacryloyloxy group, a urethane (meth)acryloyloxy group such as a methacryloyloxyethylcarbamate group, astyryl group and its derivatives, a vinyl amide group and derivativesthereof. Among these polymerizable functional groups, an acryloyloxygroup, a methacryloyloxy group, and a urethane (meth)acryloyloxy groupare preferred from the viewpoint of polymerizability. Specifically,examples of the polymerizable acid chloride include acrylic acidchloride, methacrylic acid chloride and the like. Examples of thepolymerizable isocyanate include methacryloyl isocyanate,methacryloyloxyethyl isocyanate and the like.

The chemical formulae such as the formula (F-1) representing thecompounds of the present invention represent metal complex structures,in which O—C—C—C—O indicates a resonant structure. Of course theyinclude chemically acceptable structures.

Polymerizable Compound (G-1)

The monovalent anionic bidentate ligand represented by L in the formula(G-1) is a monovalent anion compound obtainable by eliminating onehydrogen atom from a compound having in the molecule a nonioniccoordination site such as a pyridine ring, a carbonyl group, or an iminegroup, and a site that can become a monovalent anionic coordination siteupon elimination of one hydrogen ion, such as a phenyl group, a hydroxylgroup, or a carboxyl group, or from a compound having a conjugatestructure having two coordination sites that can become a monovalentanionic group as a whole upon elimination of one hydrogen ion, such as aβ-diketone. Among these compounds, preferred are compounds that can forma 5-membered or 6-membered ring structure including the iridium atomwhen the compound is coordinated to one iridium atom at the twocoordination sites thereof. Examples of such preferred compounds includemonovalent anionic compounds derived from 2-phenylpyridine, β-diketone,picolinic acid, N-alkylsalicylimine, 8-hydroxyquinoline, and derivativesthereof by eliminating one hydrogen ion. Among these bidentate ligands,monovalent anionic compounds derived from β-diketone, picolinic acid andN-alkylsalicylimine by elimination of one hydrogen atom are preferredfrom the viewpoint of light emission characteristics.

In the substituent having a polymerizable functional group representedby X^(G) in the formula (G-1), the polymerizable functional group may beany one of a radical polymerizable substituent, a cation polymerizablesubstituent, an anion polymerizable substituent, an additionpolymerizable substituent, and a condensation polymerizable substituentAmong these, a radical polymerizable functional group is preferred. Thepolymerizable functional group is preferably a group having acarbon-carbon double bond. Examples thereof include a vinyl group, anallyl group, an alkenyl group, alkenoyloxy groups such as an acryloyloxygroup and a methacryloyloxy group, a urethane (meth)acryloyloxy groupsuch as methacryloyloxyethyl carbamate, a styryl group and derivativesthereof, a vinyl amide group and derivatives thereof. Among thepolymerizable functional groups, an acryloyloxy group, a methacryloyloxygroup, a urethane (meth)acrylate and a styryl group are preferred fromthe viewpoint of polymerizability. Specifically, examples of thesubstituent having a polymerizable functional group include amethacryloyloxy group, a methacryloyloxyethylcarbamoyloxy group, and avinylbenzyloxy group. However, the present invention is by no meanslimited thereto. The position to which these substituents are bonded maybe any one of the 3-, 4-, 5- and 6-positions of the phenyl group of thephenylpyridine ligand.

In the formulae (G-1), (G-2), (G-6), (G-7), (G-9) and (G-10), the“organic group having 1 to 20 carbon atoms which may have one or moreheteroatoms” in each formula is not particularly limited as far as it isnot detrimental to the purpose of the present invention. Preferredexamples of such organic group include an alkyl group, an alkoxy group,an alkoxyalkyl group, an aryl group, an aryloxy group, an aralkyl group,an aralkoxy group having 1 to 20 carbon atoms and halogen-substitutedderivatives thereof.

Examples of the R¹ to R⁷ in the formula (G-1) include a hydrogen atom, ahalogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group such as methyl sulfonate, alkyl groups such asmethyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, andhexyl, alkoxy groups such as methoxy, ethoxy, propoxy, isobutoxy, andtert-butoxy, an aralkyl group, an acetoxy group, an ester group such aspropoxycarbonyl, and the like organic groups. These organic groups mayfurther have substituents such as a halogen atom, a nitro group, and anamino group. Among these, a hydrogen atom, a halogen atom and alkylgroups having 1 to 20 carbon atoms are preferred. It should be notedthat although in the formula (G-1), the two sets of R¹ to R⁷ bonded totwo phenylpyridine groups are explained to be the same, they may bedifferent for different phenylpyridine skeletons.

Among the compounds of the formula (G-1), those compounds in which themonovalent anionic bidentate ligand represented by L is a compoundderived from β-diketone by elimination of one hydrogen ion is indicatedby the formula (G-2).

wherein A^(1G), A^(2G), and A^(3G) independently represent a hydrogenatom, a halogen atom or an organic group having 1 to 20 carbon atomswhich may have one or more heteroatoms. X^(G) represents a substituenthaving a polymerizable functional group, and R¹ to R⁷ independentlyrepresent a hydrogen atom, a halogen atom, a nitro group, an aminogroup, a sulfonic acid group, a sulfonic acid ester group, or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms.

Examples of the A^(1G), A^(2G), and A^(3G) in the formula (G-2) includea hydrogen atom, a halogen atom, alkyl groups such as methyl, ethyl,propyl, isopropyl, butyl, isobutyl, tert-butyl, amyl, and hexyl, alkoxygroups such as methoxy, ethoxy, propoxy, isobutoxy, and tert-butoxy, anaralkyl group, an acetoxy group, an ester group such as propoxycarbonyl,and the like organic groups. These organic groups may further havesubstituents such as a halogen atom.

In the formula (G-2), the substituent having a polymerizable functionalgroup, represented by X^(G) and R¹ to R⁷ have the same meanings as thosein the formula (G-1).

The chemical formulae such as the formula (G-1) representing thecompounds of the present invention represent metal complex structures,and O—C—C—C—O in the chemical formulae such as the formula (G-2)indicates a resonant structure. Of course they include chemicallyacceptable structures.

Next, examples of the synthesis methods for the polymerizable compoundof formula (G-1) will be presented below. However, the present inventionis by no means limited thereto.

A first synthesis method for the polymerizable compounds is a method ofproducing a polymerizable compound containing a mononuclear iridiumcomplex part by reacting a binuclear iridium complex having a reactivesubstituent represented by the formula (G-6) with a compound that canbecome a monovalent anionic bidentate ligand upon elimination of onehydrogen ion to form a mononuclear iridium complex having a reactivesubstituent as an intermediate, and then reacting the reactivesubstituent of the intermediate with a compound having a polymerizablefunctional group:

wherein Y^(G) is a substituent having a reactive functional group, andR¹ to R⁷ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.

The binuclear iridium complex of the formula (G-6) can be synthesized bythe known method (S. Lamansky et al., Inorganic Chemistry, 40, 1704(2001)).

The Y^(G) in the formula (G-6) is a substituent having a reactivefunctional group, examples of which include a hydroxyl group, a mercaptogroup, an amino group, and a carboxyl group. However, the presentinvention is by no means limited thereto. The substituent Y^(G) having areactive functional group may be the above-mentioned functional group byitself or a substituent having a functional group such as ahydroxymethyl group. The reactive functional group of Y^(G) may beprotected with a protective group. In this case, the reaction isperformed by using the complex or compound having a protected reactivesubstituent as it is to obtain a mononuclear iridium complex having amonovalent anionic bidentate ligand L, which then is subjected todeprotection to obtain a mononuclear iridium complex having asubstituent Y^(G) containing a reactive functional group as anintermediate. A further reaction between the reactive substituent of theintermediate and a compound having a polymerizable functional groupgives rise to a polymerizable compound containing a mononuclear iridiumcomplex part. From the functional groups for the reactive substituentsare to be excluded the above-mentioned polymerizable functional groups.

In the formula (G-6), R¹ to R⁷ have the same meanings as those in theformula (G-1). As in the formula (G-1), the four sets of R¹ to R⁷ bondedto four phenylpyridine skeletons may be different for differentphenylpyridine skeletons.

Examples of the compound that can become a monovalent anionic bidentateligand upon elimination of one hydrogen ion include 2-phenylpyridine,β-diketone, picolinic acid, N-alkylsalicylimine, 8-hydroxyquinoline, andderivatives thereof. However, the present invention is by no meanslimited thereto.

The compound having a polymerizable functional group to be reacted withthe mononuclear iridium complex having a substituent Y^(G) containing areactive functional group obtained by the reaction between the binucleariridium complex having a substituent containing a reactive functionalgroup of the formula (G-6) and the compound that can become a monovalentanionic bidentate ligand upon elimination of one hydrogen ion must havein addition to the polymerizable group a functional group to be reactedwith a substituent Y^(G) having a reactive functional group in theformula (G-6). The R¹ to R⁷ in the formula (G-6) must be selected fromgroups that do not react with the compound having a polymerizablefunctional group to be reacted with the above-mentioned mononucleariridium complex.

Examples of the compound having a polymerizable functional group to bereacted with the above-mentioned intermediate include polymerizable acidchlorides, polymerizable alkyl halides, and polymerizable isocyanates.However, the present invention is by no means limited thereto. Thepolymerizable functional group may be any one of a radical polymerizablegroup, a cation polymerizable group, an anion polymerizable group, anaddition polymerizable group, and a condensation polymerizable group.Among these, a radical polymerizable functional group is preferred. Thepolymerizable functional group is preferably a group having acarbon-carbon double bond. Examples thereof include a vinyl group, anallyl group, an alkenyl group, alkenoyloxy groups such as an acryloyloxygroup and a methacryloyloxy group, a urethane (meth) acryloyloxy groupsuch as methacryloyloxyethyl carbamate, a styryl group and derivativesthereof, a vinyl amide group and derivatives thereof. Among thepolymerizable functional groups, an acryloyloxy group, a methacryloyloxygroup, a urethane (meth) acryloyloxy group, and a styryl group arepreferred from the viewpoint of polymerizability. Specifically, examplesof the polymerizable acid chloride include acrylic acid chloride,methacrylic acid chloride and the like. Examples of the polymerizablealkyl halide include vinylbenzyl chloride. Examples of the polymerizableisocyanate include methacryloyl isocyanate and methacryloyloxyethylisocyanate.

A second synthesis method for the polymerizable compound of the formula(G-1) is a method of directly producing a polymerizable compoundcontaining a mononuclear iridium complex part by reacting a binucleariridium complex represented by the formula (G-7) having a polymerizablefunctional group with a compound that can become a monovalent anionicbidentate ligand upon elimination of one hydrogen ion:

wherein X^(G) is a substituent having a polymerizable functional group,and R¹ to R⁷ independently represent a hydrogen atom, a halogen atom, anitro group, an amino group, a sulfonic acid group, a sulfonic acidester group, or an organic group having 1 to 20 carbon atoms which mayhave one or more heteroatoms.

In the formula (G-7), the substituent having a polymerizable functionalgroup represented by X^(G) has the same meaning as in the formula (G-1).R¹ to R⁷ have the same meanings as those in the formula (G-1).

Examples of the compound that can become a monovalent anionic bidentateligand upon elimination of one hydrogen ion include 2-phenylpyridine,β-diketone, picolinic acid, N-alkylsalicylimine, 8-hydroxyquinoline, andderivatives thereof. However, the present invention is by no meanslimited thereto.

The composition containing a polymerizable light emitting compound foruse in the polymer light emitting material of the present invention maycontain an electron transporting compound for forming an electrontransport layer. As the electron transporting compound, known electrontransporting material, such as quinolinol derivative metal complexes,oxadiazole derivatives, and triazole derivatives may be used. However,the present invention is by no means limited thereto. The electrontransporting materials may be used singly or in admixture with otherelectron transporting materials.

The electron transporting compound contained in the compositioncontaining a polymerizable light emitting compound used for the polymerlight emitting material of the present invention may be a electrontransporting material that is polymerizable. The use of electrontransporting compound being polymerizable is more preferable, since thefreedom in selecting the composition containing a polymerizable lightemitting compound for use in the polymer light emitting material of thepresent invention is increased.

Examples of the polymerizable electron transporting compound includethose compounds composed of the above-mentioned known electrontransporting compounds such as quinolinol derivative metal complex suchas Alq₃ (trisquinolinol aluminum), oxadiazole derivatives, and triazolederivatives to which at least one polymerizable functional group, suchas a (meth) acrylic group, a vinyl group, a styryl group, an isocyanategroup, or a thiocyanate group, is bonded. Specific examples thereofinclude bisquinolinol methacryloyloxy quinolinol aluminum, quinolinolbismethacryloyloxy quinolinol aluminum, methacryloyloxy oxadiazole,styryl oxadiazole, bisstyryl oxadiazole and the like. In the case of thepolymerizable electron transporting compound, crosslinking polymerizableelectron transporting compounds such as quinolinol bismethacryloyloxyquinolinol aluminum and bisstyryl oxadiazole are preferred.

The composition containing a polymerizable light emitting compound foruse in the polymer light emitting material of the present invention maycontain other polymerizable compounds. The existence of otherpolymerizable compounds in the composition is preferable since suchincreases the freedom in selecting the composition.

Other polymerizable compounds are not particularly limited as far asthey do not inhibit light emission of the polymer light emittingmaterial of the present invention. Examples thereof include methylmethacrylate, ethyl acrylate, ethylene glycol dimethacrylate, propyleneglycol diacrylate, trimethylolpropane triacrylate, styrene, stilbene andthe like. In the case of other polymerizable compounds, crosslinkingcompounds such as ethylene glycol dimethacrylate, propylene glycoldiacrylate, trimethylolpropane triacrylate and stilbene are preferred.

The polymerizable composition for use in the polymer light emittingmaterial of the present invention may contain a polymerizationinitiator. Any polymerization initiator may be used without particularlimitations as far as it can initiate the polymerization of theabove-mentioned polymerizable functional groups. Depending on themechanism of polymerization of the polymerizable functional group, aradical polymerization initiator, a cation polymerization initiator, ananion polymerization initiator and the like can be used. A radicalpolymerization initiator is preferred. Further, classifying thepolymerization initiators by the mechanism of their activation, athermal polymerization initiator and an optical polymerization initiatorcan be used. The optical polymerization initiator as used herein refersto those that initiate polymerization by actinic rays such as visiblelight, ultraviolet ray, electron beam, and gamma ray.

Examples of the thermal radical polymerization initiator include azocompounds such as 2,2′-azobisisobutyronitrile (AIBN) and2,2′-azobisisovaleronitrile, ketone peroxides such as methyl ethylketone peroxide, methyl isobutyl ketone peroxide, and cyclohexanoneperoxide, diacyl peroxides such as benzoyl peroxide, decanoyl peroxide,and lauroyl peroxide, dialkyl peroxides such as dicumyl peroxide,t-butyl cumyl peroxide, and di-t-butyl peroxide, peroxy ketals such as1,1-bis(t-hexyl-peroxy)-3,3,5-trimethylcyclohexane,1,1-di-t-butylperoxy-cyclohexane, and 2,2-(di-t-butylperoxy)butane,alkyl peroxy esters such as t-butyl peroxypivalate, t-butylperoxy-2-ethylhexanoate, t-butyl peroxyisobutyrate, di-t-butylperoxyhexahydroterephthalate, di-t-butyl peroxyazelate, t-butylperoxy-3,5,5-trimethylhexanoate, t-butyl peroxyacetate, t-butylperoxybenzoate, di-t-butyl peroxytrimethyladipate, t-butylperoxy-2-ethylhexanoate, t-hexyl peroxy-2-ethylhexanoate, percarbonatessuch as diisopropyl peroxydicarbonate, di-sec-butyl peroxydicarbonate,and t-butyl peroxyisopropylcarbonate, and the like.

Examples of the optical radical polymerization initiator includeacetophenone, acetophenone derivatives such as2,2-dimethoxy-2-phenylacetophenone, diethoxyacetophenone,1-hydroxycyclohexylphenylketone,2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-1-propanone,2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-1-butanone, and2-hydroxy-2-methyl-1-phenylpropan-1-one, benzophenone, benzophenonederivatives such as 4,4′-bis(dimethylamino)benzophenone, and4-trimethylsilylbenzophenone, 4-benzoyl-4′-methyldiphenyl sulfide,benzoin, benzoin derivatives such as benzoin ethyl ether, benzoin propylether, benzoin isobutyl ether, and benzoin isopropyl ether, methylphenyl glyoxylate, benzoin dimethyl ketal,2,4,6-trimethylbenzoyldiphenylphosphine oxide, and so forth.

The use amount of the polymerization initiators is in a range of from0.001 to 5 mass % and preferably from 0.01 to 1 mass %, based on theweight of the polymerizable composition of the present invention.

The polymerizable composition containing at least one light emittingcompound of the present invention can be formed in a form of a film on alayer that serves as a base by a coating method. The layer that servesas a base may vary depending on the construction of the organic lightemitting device. In the case of the device shown in FIG. 1, the holetransporting layer 3 serves as a base layer, and in Examples 19 to 22,an ITO anode serves as a base layer. Upon coating the polymerizablecomposition containing at least one light emitting compound of thepresent invention on a base layer, the composition may also be coatedafter diluting it with a solvent. The dilution with a solvent candecrease the viscosity of the composition so that the film thickness canbe reduced. The solvent used can be removed by a treatment such asheating or reduction in pressure before, during or after thepolymerization.

Although it is not generally limited, the thickness of the lightemitting layer composed of the polymer light emitting material of thepresent invention is preferably from 1 nm to 10 μm and more preferablyfrom 5 nm to 1 μm.

A layer containing a light emitting material for organic light emittingdevice of the present invention can be prepared by forming (for example,by coating) a composition containing a polymer light emitting materialinto a form of a film on a layer that serves as a base for an organic ELdevice, or by forming a polymerizable composition containing at leastone light emitting compound into a form of a film on a layer that servesas a base for an organic EL device and then polymerizing it to form apolymer.

The layer containing a light emitting material for organic lightemitting device as used herein means (1) a layer containing only a lightemitting material, (2) a layer containing a hole transporting material,a light emitting material and an electron transporting material, (3) alayer containing a hole transporting material and a light emittingmaterial, or (4) a layer containing a light emitting material and anelectron transporting material.

When a polymer light emitting material has a crosslinked structure, itis difficult that the polymer obtained by polymerizing is formed into afilm under normal conditions. In the case where the crosslinkablecompound having two or more polymerizable functional groups ishomopolymerized by a solution polymerization method, the crosslinkedpolymer precipitates in the solvent as insoluble matter. Therefore, thecrosslinked polymer in film form can be produced by dissolving apolymerizable light emitting compound into a solvent or other liquidmonomers, forming it into a film by printing methods such as a spincoating method, dip coating and ink jet printing method, screen printingmethod and micro gravure method, and then polymerizing it.

In the case of copolymerizing of the crosslinkable compound with a largeamount of monofunctional monomers, copolymer having a solubility to thesolvent can be obtained and be coated on a substrate of an organic lightemitting device in liquid state. In this case, the monofunctionalmonomer must be used in large excess to an amount of the crosslinkablecompound.

In the organic light emitting device of the present invention, formationof a hole transport layer and an electron transport layer on the bothsides or one side of the light emitting layer can further improve thelight emission efficiency and/or durability of the device.

As the hole transport material for forming a hole transport layer, knownhole transport materials such as triphenylamine derivatives, e.g., TPD(N,N′-diphenyl-N,N′-(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine), α-NPD(4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl), and m-MTDATA(4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine), andpolyvinylcarbazole may be used. These hole transporting materials may beused singly or in admixture with or laminated on other hole transportingmaterials. The thickness of the hole transport layer also depends on theelectroconductivity of the hole transport layer so that it cannot begenerally limited. However, it is preferably from 10 nm to 10 μm andmore preferably from 10 nm to 1 μm.

As the electron transporting material for forming an electron transportlayer, known electron transporting material, such as quinolinolderivatives metal complexes, e.g., Alq₃ (trisquinolinol aluminum),oxadiazole derivatives, and triazole derivatives may be used. However,the present invention is by no means limited thereto. The electrontransporting materials may be used singly or in admixture with orlaminated on other electron transporting materials. The thickness of theelectron transport layer also depends on the electroconductivity of theelectron transport layer so that it cannot be generally limited.However, it is preferably from 10 nm to 10 μm and more preferably from10 nm to 1 μm.

The light emitting material, hole transport material and electrontransport material used in the above-mentioned light emitting layer canbe used singly for forming each layer. In addition, the polymer materialmay be used as a binder for forming each layer. Examples of the polymermaterial used for this purpose include polymethyl methacrylate,polycarbonate, polyester, polysulfone, polyphenylene oxide and the like.However, the present invention is by no means limited thereto.

The light emitting material, hole transporting material and electrontransporting material used in the above-mentioned light emitting layercan be formed into a film by using various methods such as a resistanceheating vapor deposition method, an electron beam vapor depositionmethod, a sputtering method, a coating method, a solution coatingmethod, and a printing method and the present invention is notparticularly limited thereto. In the case of low molecular weightcompounds, mainly resistance heating vapor deposition and electron beamvapor deposition are frequently used. In the case of polymer materials,mainly a casting method and a solution casting method are frequentlyused.

As the anode material of the organic light emitting device of thepresent invention, known transparent electroconductive materials such asITO (indium tin oxide), tin oxide, zinc oxide, electroconductivepolymers, e.g., polythiophene, polypyrrole and polyaniline can be used.However, the present invention is not particularly limited thereto. Thesurface resistance of the electrode made of such a transparentelectroconductive material is preferably 1 to 50Ω/□ (ohm/square). Suchan anode material can be formed into a film by various methods such asan electron bean vapor deposition method, a sputtering method, achemical reaction method, and a coating method. However, the presentinvention is not particularly limited thereto. The thickness of theanode is preferably from 50 to 300 nm.

For the purpose of relaxation of the injection barrier wall, a bufferlayer may be inserted between the anode and a hole transport layer orbetween the anode and an organic layer laminated adjacent to the anode.For the buffer layer, known materials such as copper phthalocyanine andpolyethylene dioxythiophene may be used. However, the present inventionis not particularly limited thereto.

As the cathode material of the organic light emitting device of thepresent invention, known cathode materials, for example, Al, Mg—Agalloys, alkaline earth metals such as Ca, alloys of Al and an alkalinemetal, such as Al—Ca, and the like may be used. However, the presentinvention is not particularly limited thereto. As the method of forminga film of these cathode materials, a resistance heating vapor depositionmethod, an electron beam vapor deposition method, a sputtering method,an ion plating method and the like can be used. However, the presentinvention is not particularly limited thereto. The thickness of thecathode is preferably from 10 nm to 1 μm and more preferably from 50 to500 nm.

For the purpose of improving the efficiency of electron injection, aninsulating layer having a thickness of 0.1 to 10 nm may be insertedbetween the cathode and an electron transport layer or between thecathode and an organic layer laminated adjacent to the cathode. For theinsulating layer, known cathode materials such as lithium fluoride,magnesium fluoride, magnesium oxide, and alumina may be used. However,the present invention is not particularly limited thereto.

Furthermore, in order to prevent holes to pass through the lightemitting layer and allow holes to efficiently recombine with electronswithin the light emitting layer, a hole blocking layer may be providedadjacent to the cathode side of the light emitting layer. For formingsuch a hole blocking layer, known materials such as triazole derivativesand oxadiazole derivatives may be used. However, the present inventionis not particularly limited thereto.

As the substrate of the organic light emitting device of the presentinvention, an insulating substrate transparent to the emissionwavelength of the light emitting material may be used. As such, knownmaterials such as transparent plastics including PET (polyethyleneterephthalate) and polycarbonate as well as glass may be used. However,the present invention is not particularly limited thereto.

The organic light emitting device of the present invention canconstitute a matrix-type or segment-type pixels by a known method. Also,it can be used as a backlight without forming pixels.

However, the present invention is not particularly limited thereto.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the present invention will be described in more detail byreferring to typical examples. However, the examples are merelyexemplary for the purpose of explanation and the present inventionshould by no means be limited thereto.

<Measurement Apparatus, Etc.> 1) ¹H-NMR

JNM EX270 manufactured by JEOL, Ltd.

270 MHz

Solvent: chloroform-d₁ or dimethyl sulfoxide-d₆

2) GPC Measurement (Measurement of Molecular Weight)

Column: Shodex KF-G+KF804L+KF802+KF801

Eluent: Tetrahydrofuran (THF)

Temperature: 40° C.

Detector: RI (Shodex RI-71)

3) Elementary Analysis Equipment

Model CHNS-932, manufactured by LECO

4) ICP Elementary Analysis

ICPS 8000, manufactured by Shimadzu Corporation

<Reagents>

Unless otherwise indicated specifically, commercially availablepreparation (reagent grade) was used without purification.

EXAMPLE 1 Synthesis of Polymerizable Compound Ir(3-MA-PPy) (3-PrCO-PPy)₂

(1) 2-(3-Methoxyphenyl)pyridine (3-MeO-PPy) was synthesized by aconventional method.

That is, as shown in the reaction scheme below,(3-methoxyphenyl)magnesium bromide was synthesized from 22.4 g (120mmol) of 3-bromoanisole with 3.4 g of magnesium in dry tetrahydrofuran(THF) in an argon stream by a conventional manner. This was slowly addedto a dry THF solution of 15.8 g (100 mmol) of 2-bromopyridine and 1.8 gof (1,2-bis(diphenylphosphino)ethane)dichloronickel (II) (Ni(dppe)Cl₂)and the mixture was stirred at 50° C. for 1 hour. After adding 250 ml of5% hydrochloric acid aqueous solution to the reaction mixture, thereaction mixture was extracted with chloroform to obtain a targetsubstance and the organic layer was distilled under reduced pressure.17.4 g (93.9 mmol) of 2-(3-methoxyphenyl)pyridine (3-MeO-PPy) wasobtained as a colorless transparent liquid. Identification was performedby CHN elementary analysis and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 8.68 (d, 1H), 7.72 (m, 2H), 7.59 (s, 1H), 7.54(d, 1H), 7.37 (t, 1H), 7.22 (d, 1H), 6.97 (d, 1H), 3.89 (s, 3H).

Elementary analysis Calcd: C, 77.81; H, 5.99; N, 7.56. Found: C, 77.44;H, 6.01; N, 7.53.

(2) Then, 3-MeO-PPy thus obtained and tris(acetylacetonato)iridium (III)(Ir(acac)₃) were allowed to react at a high temperature as shown in thereaction scheme below to synthesizetris[2-(3-methoxyphenyl)pyridine]iridium (III) (Ir(3-MeO-PPy)₃).

That is, 5.00 g (27.0 mmol) of 3-MeO-PPy and 2.0 g (4.1 mmol) ofIr(acac)₃ were allowed to react in 200 ml of glycerol at 250° C. for 9hours and purified using column chromatography to obtain 0.400 g (0.54mmol) of Ir(3-MeO-PPy)₃ as yellow powder.

Repeating the above-mentioned operation 8 times afforded 3.20 g (4.32mmol) in total of Ir(3-MeO-PPy)₃.

Identification of the product was performed by ¹H-NMR and CHN elementaryanalysis.

¹H-NMR (CDCl₃, ppm): δ 7.82 (d, 3H), 7.56 (t, 3H), 7.53 (s, 3H), 7.25(d, 3H), 6.84 (t, 3H), 6.67 (d, 3H), 6.60 (d, 3H), 3.80 (s, 9H).

Elementary analysis Calcd: C, 58.05; H, 4.06; N, 5.64. Found: C, 57.60;H, 4.17; N, 5.57.

(3) The Ir(3-MeO-PPy)₃ thus obtained was subjected to hydrolysis in anaqueous solution of hydrochloric acid by a conventional method toconvert the methoxy groups to hydroxyl groups to obtain[2-(3-hydroxyphenyl)pyridine]iridium (III) (Ir(3-HO-PPy)₃) as powder asshown in the reaction scheme below.

(4) Ir(3-HO-PPy)₃ was allowed to react with methacryloyl chloride in amolar ratio of 1:1 by the reaction scheme below to esterify a part ofthe hydroxyl groups thereof, thereby synthesizing a complex composedmainly of Ir(3-MA-PPy) (3-HO-PPy)₂. Then, the remaining hydroxyl groupswere allowed to react with propionyl chloride (PrCOCl) to obtain acomplex composed mainly of Ir(3-MA-PPy)(3-PrCO-PPy)₂.

That is, after charging 32 ml of dry THF, 2.81 g (4 mmol) ofIr(3-HO-PPy)₃ and 2.40 g (23.6 mmol) of triethylamine as a base in areactor, a solution of 0.424 g (4 mmol) of methacryloyl chloride in 16ml of dry THF was dripped over 30 minutes and the mixture was stirred at20° C. for 5 hours. To this reaction mixture, a solution of 1.48 g (16mmol) of propionyl chloride in 16 ml of dry THF was dripped over 30minutes, followed by reaction of the resulting mixture at 20° C. for 5hours to esterify the remaining hydroxyl groups to react. Thentriethylamine hydrochloride was filtered off. The solvent in thefiltrate was evaporated to dryness and the solid component was purifiedby recrystallization from chloroform/methanol mixed solvent 2 times toafford 2.305 g (2.60 mmol) of the objective compoundIr(3-MA-PPy)(3-PrCO-PPy)₂ as powder. Identification of the product wasperformed by ¹H-NMR and CHN elementary analysis.

¹H-NMR (CDCl₃, ppm): δ 7.82 (m, 3H), 7.56 (m, 6H), 7.26 (m, 3H), 6.84(m, 3H), 6.67 (m, 3H), 6.61 (m, 3H), 6.35 (s, 1H), 5.74 (s, 1H), 2.67(q, 4H), 2.08 (s, 3H), 1.42 (t, 6H).

Elementary analysis Calcd: C, 58.49; H, 4.11; N, 4.76. Found: C, 58.13;H, 4.10; N, 4.72.

EXAMPLE 2 Synthesis of Ir(3-MA-PPy)(3-PrCO-PPy)₂ Polymer

In a reactor were charged 2.22 g (2.5 mmol) of Ir(3-MA-PPy)(3-PrCO-PPy)₂complex synthesized in Example 1, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below).After completion of the reaction, the reaction mixture was dripped intoacetone to perform reprecipitation and the resultant polymer wasrecovered by filtration. A procedure of reprecipitation by dripping achloroform solution of the recovered polymer into methanol was furtherrepeated 2 times to purify the polymer, which was then recovered anddried in vacuum to afford 1.85 g of the objectiveIr(3-MA-PPy)(3-PrCO-PPy)₂ polymer as powder. The elementary analysis ofC, H, N and Ir of the obtained polymer indicated that the polymer hadthe same composition as Ir (3-MA-PPy)(3-PrCO-PPy)₂. The weight averagemolecular weight of the polymer was 8,000 in terms of polystyrene (byGPC measurement using HFIP (hexafluoroisopropanol) as an eluent).

EXAMPLE 3 Synthesis of Polymerizable Compound Ir(3-MOI-PPy)(3-PrCO-PPy)₂

A monomer intermediate Ir(3-HO-PPy)₃ synthesized in the same manner asin Example 1 was allowed to react with 2-methacryloyloxyethyl isocyanate(Trade name “Karenz MOI”, manufactured by Showa Denko K. K., hereinaftersometimes referred to as “MOI”) in a ratio of 1:1 (molar ratio) and thenthe remaining hydroxyl groups were allowed to react with PrCOCl toobtain a complex composed mainly of Ir(3-MOI-PPy) (3-PrCO-PPy)₂.

That is, in a reactor were charged 32 ml of dry THF, 2.81 g (4 mmol) ofIr(3-HO-PPy)₃, and 0.636 g (4 mmol) of MOI, and after addition of acatalyst amount of dibutyltin (IV) dilaurate, the mixture was allowed toreact at 20° C. for 5 hours. To this reaction mixture was added 2.400 g(24.5 mmol) of triethylamine as a base. Thereafter, a solution of 1.48 g(16 mmol) of propionyl chloride in 16 ml of dry THF was dripped over 30minutes, followed by reaction at 20° C. for 5 hours to react theremaining hydroxyl groups. Then triethylamine hydrochloride was filteredoff. The solvent in the filtrate was evaporated to dryness and the solidcomponent was purified by performing recrystallization fromchloroform/methanol mixed solvent 2 times to afford 2.62 g (2.70 mmol)of the objective compound Ir(3-MOI-PPy)(3-PrCO-PPy)₂ as powder.Identification of the product was performed by ¹H-NMR and CHN elementaryanalysis.

¹H-NMR (CDCl₃, ppm): δ 7.82 (m, 3H), 7.56 (m, 6H), 7.26 (m, 3H), 6.84(m, 3H), 6.67 (m, 3H), 6.61 (m, 3H), 6.14 (s, 1H), 5.61 (s, 1H), 5.23(br, 1H), 4.29 (t, 2H), 3.58 (m, 2H), 2.66 (q, 4H), 1.95 (s, 3H), 1.41(t, 6H).

Elementary analysis Calcd: C, 56.95; H, 4.26; N, 5.78. Found: C, 56.58;H, 4.25; N, 5.72.

EXAMPLE 4 Synthesis of Ir(3-MOI-PPy)(3-PrCO-PPy)₂ polymer

In a reactor were charged 2.43 g (2.5 mmol) of Ir(3-MOI-PPy)(3-PrCO-PPy)₂ complex synthesized in Example 1, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below).

After completion of the reaction, the reaction mixture was dripped intoacetone to perform reprecipitation and the resultant polymer wasrecovered by filtration. A procedure of reprecipitation by dripping achloroform solution of the recovered polymer into methanol was furtherrepeated 2 times to purify the polymer, which was then recovered anddried in vacuum to afford 2.05 g of the objectiveIr(3-MOI-PPy)(3-PrCO-PPy)₂ polymer as powder. The elementary analysis ofC, H, N and Ir of the obtained polymer indicated that the polymer hadsubstantially the same composition as Ir(3-MOI-PPy) (3-PrCO-PPy)₂. Theweight average molecular weight of the polymer was 18,000 in terms ofpolystyrene (by GPC measurement using HFIP (hexafluoroisopropanol) as aneluent).

EXAMPLE 5 Synthesis of (HPPy) Polymer Ir/PPy Complex

As shown in Reaction Scheme below, 1.98 g (5.00 mmol) of5-bromo-2-(4-bromo-3-hexylphenyl)pyridine (HPPyBr₂) was polymerized in10 ml of N,N-dimethylformamide (DMF) with bis(cyclooctadine)nickel(0)(Ni(COD)₂), cyclooctadiene (COD) and 2,2′-bipyridine as catalysts by aconventional method to synthesize hexylphenylpyridine polymer (HPPypolymer).

Then, 0.625 g (4 mmol) of the HPPy polymer and 0.099 g (0.2 mmol) ofIr(acac)₃ were dissolved in m-cresol and allowed to react at 250° C. for10 hours. Further, to this solution was added 0.062 g (0.4 mmol) of2-phenylpyridine (PPy) and the mixture was allowed to react at 250° C.for 10 hours. After completion of the reaction, the reaction mixture wasdripped into acetone to perform reprecipitation and the obtained polymerwas recovered by filtration. A procedure of reprecipitation by drippinga DMF solution of the recovered polymer into acetone was furtherrepeated 2 times to purify the polymer, which was then recovered anddried in vacuum to afford 0.564 g of the objective (HPPy) Polymer Ir/PPycomplex as powder. The elementary analysis of C, H, N and Ir of theobtained polymer supported the presumed structure of the polymer. Theweight average molecular weight of the polymer was 23,000 in terms ofpolystyrene (by GPC measurement using HFIP (hexafluoroisopropanol) as aneluent).

EXAMPLE 6 TO 8 Fabrication and Evaluation of Organic Light EmittingDevices

5 Mass % hexafluoroisopropanol (HFIP) solutions of three phosphorescentpolymers synthesized in Examples 2, 4 and 5, i.e.,Ir(3-MA-PPy)(3-PrCO-PPy)₂ polymer, Ir (3-MOI-PPy) (3-PrCO-PPy)₂ polymer,and (HPPy) polymer Ir/PPy complex, respectively, were each coated in asize of 5 mm×5 mm by a spin coating method on an ITO anode (ITO-coatedglass substrate) on which polyethylenedioxythiophene (PEDOT,manufactured by Bayer AG) had been preliminarily coated to a thicknessof 500 Angstroms and dried by heating at 80° C. in vacuum for 10 hoursto form phosphorescent polymer layer having a thickness of about 1,000Angstroms on the PEDOT/ITO anode for each polymer.

On the three types of (two for each) phosphorescent polymer/PEDOT/ITOelectrodes, a layer of PBD(2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole) was formed asan electron transport layer to a thickness of about 500 Angstroms byvacuum deposition. Subsequently, on the electron transport layer wasformed a layer of Ag/Mg in atomic ratio of 1/10 to a thickness of about1,000 Angstroms to fabricate 6 (two for each polymer) organic lightemitting devices. To these devices attached lead wires under argonatmosphere in a glove box and the devices were sealed in a glass tubeunder argon atmosphere and used for evaluation of luminescence.

The luminance of the devices was measured by using a luminance meterBM-8, manufactured by Topcon Corporation while applying a voltage to theorganic light emitting device using a programmable directvoltage/current source TR6143, manufactured by Advantest Corporation.

When the DC voltage was applied, luminescence starting voltage, initialluminance at a voltage of 10 V and luminance after 240 hours'consecutive luminescence with a fixed voltage of 10 V were obtained asshown in Table 1 (as an average of the two devices for each polymer).

COMPARATIVE EXAMPLES 1 AND 2 Fabrication and Evaluation of Organic LightEmitting Devices

Four (two for each polymer) of organic light emitting devices werefabricated in the same manner as in Example 6, 7 and 8 except that 5mass % chloroform solutions of intermediate complex Ir(3-MeO-PPy)₃synthesized in Example 1 and PMMA (poly(methyl methacrylate)) in placeof the 5 mass % HFIP solutions of the three phosphorescent polymers usedin Examples 6, 7 and 8 in proportions shown in Table 2. When a DCvoltage was applied to the fabricated devices in the same manner as inExamples 6, 7 and 8, luminescence starting voltage was 10 V and 11 V,respectively. Initial luminance at a voltage of 12 V, and luminanceafter 240 hours' consecutive luminescence with a fixed voltage of 12 Vwere as shown in Table 2 (as an average of the two devices for eachpolymer).

TABLE 1 Luminescence Starting 10 V Luminance (Cd/m²) Voltage After 240Example Phosphorescent Polymer (V) Initial Hours 6 Ir(3-MA-PPy)(3-PrCO-PPy)₂ Polymer 5 1280 1180 7 Ir(3-MOI-PPy) (3-PrCO-PPy)₂ Polymer6 1450 1250 8 (HPPy) Polymer Ir/PPy Complex 3 730 680

TABLE 2 Luminescence Starting 12 V Luminance (Cd/m²) Comparative Complex(Ir(3-MeO-PPy)₃)/PMMA Voltage After 240 Example (Mass Ratio) (V) InitialHours 1 1/5 10 150 70 2 1/2 11 120 50

EXAMPLE 9 Fabrication and Evaluation of an Organic Light Emitting DeviceUsing a Light Emitting Composition Composed of a Phosphorescent PolymerCompound and a Hole Transporting Polymer Compound

3 mass % chloroform solution of the phosphorescent polymer synthesizedin Example 4, i.e., Ir(3-MOI-PPy) (3-PrCO-PPy)₂ polymer andpoly(N-vinylcarbazole) was prepared. The solution contained the polymersin a ratio of 70 mass % of the Ir(3-MOI-PPy)(3-PrCO-PPy)₂ polymer to 30mass % of the poly(N-vinylcarbazole). Two organic light emitting deviceswere fabricated in the same manner as in Examples 6, 7 and 8 except thatthis solution was used in place of the 5 mass % HFIP solutions of thethree phosphorescent polymer used in Examples 6, 7 and 8. When a DCvoltage was applied to the fabricated devices in the same manner as inExamples 6, 7 and 8, the luminescence starting voltage was 5 V and theluminance at 12 V was 1,860 cd/m², and the luminance after 240 hours'consecutive luminescence at a fixed voltage of 12 V was 1,690 cd/r² (asan average of the two devices for each polymer).

EXAMPLE 10 Fabrication and Evaluation of an Organic Light EmittingDevice Using a Light Emitting Composition Composed of a PhosphorescentPolymer Compound and an Electron Transporting Low Molecular WeightCompound

4 mass % chloroform solution of the phosphorescent polymer synthesizedin Example 4, i.e., Ir(3-MOI-PPy) (3-PrCO-PPy)₂ polymer and PBD wasprepared. The solution contained the polymers in a ratio of 70 mass % ofthe Ir(3-MOI-PPy) (3-PrCO-PPy)₂ polymer to 30 mass % of the PBD. Thissolution was coated in a size of 5 mm×5 mm by a spin coating method onan ITO anode (ITO-coated glass substrate) on whichpolyethylenedioxythiophene (PEDOT, manufactured by Bayer AG) had beenpreliminarily coated to a thickness of 500 Angstroms and dried byheating at 80° C. in vacuum for 10 hours to form phosphorescent polymercomposition layer having a thickness of about 1,000 Angstroms on thePEDOT/ITO anode. Subsequently, on each the phosphorescent polymercomposition layer was formed a film of Ag/Mg (weight ratio: 9/1) as acathode to a thickness of about 1,000 Angstroms to fabricate two organiclight emitting devices. To these devices were attached lead wires in anargon atmosphere in a glove box and the devices were sealed in a glasstube in an argon atmosphere and used for evaluation of luminescence.When a DC voltage was applied to the fabricated devices in the samemanner as in Examples 6, 7 and 8, the luminescence starting voltage was6 V and the luminance at 12 V was 1,580 cd/m², and the luminance after240 hours' consecutive luminescence at a fixed voltage of 12 V was 1,340cd/m² (as an average of the two devices for each polymer).

EXAMPLE 11 Fabrication and Evaluation of an Organic Light EmittingDevice Using a Light Emitting Composition Composed of a PhosphorescentPolymer Compound and an Electron Transporting Polymer Compound

3 mass % chloroform solution of the phosphorescent polymer synthesizedin Example 4, i.e., Ir(3-MOI-PPy) (3-PrCO-PPy)₂ polymer and the poly PBDsynthesized by the method disclosed in Japanese Patent ApplicationLaid-open No. 10-1665 was prepared. The solution contained the polymersin a ratio of 70 mass % of the Ir(3-MOI-PPy)(3-PrCO-PPy)₂ polymer to 30mass % of the poly PBD. Two organic light emitting devices werefabricated in the same manner as in Example 10 except that this solutionwas used in place of the 5 mass % chloroform solution of thephosphorescent polymer and PBD used in Example 10. When a DC voltage wasapplied to the fabricated devices in the same manner as in Examples 6, 7and 8, the luminescence starting voltage was 5 V and the luminance at 12V was 1,710 cd/r², and the luminance after 240 hours' consecutiveluminescence at a fixed voltage of 12 V was 1,580 cd/m² (as an averageof the two devices for each polymer).

EXAMPLE 12 Synthesis of Polymerizable Light Emitting CompoundIr(3-MA-PPy)₃

In the same manner as in the synthesis described in Example 1,Ir(3-MeO-PPy)₃ was subjected to hydrolysis of methoxy groups in anaqueous solution of hydrochloric acid to convert them into hydroxylgroups to obtain tris(3-hydroxyphenylpyridine) iridium (III)(Ir(3-HO-PPy)₃) as powder (cf. Reaction Scheme below).

Then, Ir(3-HO-PPy)₃ was allowed to react with methacryloyl chloride in amolar ratio of 1:3 to esterify all the hydroxyl groups thereof tosynthesize an Ir(3-MA-PPy)₃ complex.

That is, in a reactor were charged 32 ml of dry THF, 2.81 g (4 mmol) ofIr(3-HO-PPy) 3 and 2.40 g (23.6 mmol) of triethylamine as a base and asolution of 1.293 g (12.2 mmol) of methacryloyl chloride in 32 ml of dryTHF was dripped over 90 minutes to perform reaction at 20° C. for 5hours. The precipitated triethylamine hydrochloride was filtered off andthe solvent in the filtrate was evaporated to dryness. The obtainedsolid component was purified by performing recrystallization from amixed solvent of hexafluoroisopropanol/methanol two times to obtain2.805 g (3.08 μmol) of the objective trifunctional Ir(3-MA-PPy)₃ aspowder. Identification of the product was performed by ¹H-NMR and CHNelementary analysis.

¹H-NMR (CDCl₃, ppm): δ 7.82 (d, 3H), 7.58 (t, 3H), 7.55 (s, 3H), 7.26(d, 3H), 6.86 (t, 3H), 6.67 (d, 3H), 6.63 (d, 3H), 6.36 (s, 3H), 5.74(s, 3H), 2.09 (s, 9H).

Elementary analysis Calcd: C, 59.59; H, 4.00; N, 4.63. Found: C, 59.21;H, 3.98; N, 4.58.

EXAMPLE 13 Synthesis of Polymerizable Light Emitting CompoundIr(3-MOI-PPy)₂(3-PrCO-PPy)

The monomer intermediate Ir(3-HO-PPy)₃ synthesized in the same manner asin Example 1 was allowed to react with 2-methacryloyloxyethyl isocyanate(Trade name “Karenz MOI”, manufactured by Showa Denko K. K., hereinaftersometimes referred to as “MOI”) in a ratio of 1:3 (by mole) and theremaining OH group was allowed to react with propionyl chloride (PrCOCl)to obtain an Ir (3-MOI-PPy)₂ (3-PrCO-PPy) complex.

That is, in a reactor were charged 48 ml of dry THF and 2.81 g (4 mmol)of Ir(3-HO-PPy)₃ and 1.272 g (8 mmol) of MOI and a catalyst amount ofdibutyltin (IV) dilaurate was added thereto, and the mixture was allowedto react at 20° C. for 5 hours. After adding 2.400 g (24.5 mmol) oftriethylamine as a base to the reaction mixture, a solution of 0.74 g(8.0 mmol) of PrCOCl in 8 ml of dry THF was dripped over 30 minutes andthe mixture was allowed to react at 20° C. for additional 5 hours toesterify the remaining hydroxyl groups. The precipitated triethylaminehydrochloride was filtered off and the solvent in the filtrate wasevaporated to dryness. The obtained solid component was purified byperforming recrystallization from a mixed solvent of chloroform/methanoltwo times to obtain 2.75 g (2.57 mmol) of the objectiveIr(3-MOI-PPy)₂(3-PrCO-PPy) as powder. Identification of the product wasperformed by 1H-NMR and CHN elementary analysis.

¹H-NMR (CDCl₃₁ ppm): δ 7.81 (m, 3H), 7.54 (m, 6H), 7.26 (m, 3H), 6.86(m, 3H), 6.68 (m, 3H), 6.59 (m, 3H), 6.13 (s, 2H), 5.60 (s, 2H), 5.22(br, 2H), 4.27 (t, 4H), 3.57 (m, 4H), 2.67 (q, 2H), 1.95 (s, 6H), 1.41(t, 3H).

Elementary analysis Calcd: C, 56.17; H, 4.34; N, 6.55. Found: C, 55.86;H, 4.37; N, 6.51.

EXAMPLES 14 TO 19 Fabrication and Evaluation of Organic Light EmittingDevices Using Polymerizable Compositions

10 Mass % chloroform solutions of combinations of the fourphosphorescent polymerizable compounds synthesized in Examples 1, 3, 12and 13, i.e., monofunctional Ir(3-MA-PPy) (3-PrCO-PPy)₂, monofunctionalIr(3-MOI-PPy) (3-PrCO-PPy)₂, trifunctional (3-MOI-PPy)₃, andbifunctional (3-MOI-PPy)₂(3-PrCO-PPy), respectively as shown in Table 3were prepared. After addition of AIBN (azobisbutyronitrile) as apolymerization initiator in an amount of 2 mass parts per 100 mass partsof the total amount of the monomers, each of the solutions was coated inan area of a size of 5 mm×5 mm by a spin coating method on an ITO anode(ITO-coated glass substrate) on which polyethylenedioxythiophene (PEDOT,manufactured by Bayer AG) had been preliminarily coated to a thicknessof 500 Angstroms. This was dried by heating at 60° C. for 2 hours topolymerize and cure each monomer and further dried at 80° C. underreduced pressure for 8 hours to form phosphorescent polymer layer havinga thickness of about 1,000 Angstroms on the PEDOT/ITO anode for eachcombination.

On each of the six types of (total twelve) phosphorescentpolymer/PEDOT/ITO electrodes, a layer of TAZ(3-(4-biphenylyl)-4-phenyl-5-(4-tert-butylphenyl)-1,2,4-triazole) wasformed as an electron transport layer to a thickness of about 500Angstroms by vacuum deposition. Subsequently, on the electron transportlayer was formed a layer of Ag/Mg (mass ratio: 9/1) as a cathode to athickness of about 1,000 Angstroms to fabricate 6 (two for each polymer)organic light emitting devices. To these devices were attached leadwires in an argon atmosphere in a glove box and the devices were sealedin a glass tube in an argon atmosphere and used for evaluation ofluminescence.

The luminance of the devices was measured by using a luminance meterBM-8, manufactured by Topcon Corporation while applying a voltage to theorganic light emitting device using a programmable directvoltage/current source TR6143, manufactured by Advantest Corporation.

When the DC voltage was applied, luminescence starting voltage, initialluminance at 10 V and luminance after 240 hours' consecutiveluminescence with a fixed voltage of 10 V were obtained as shown inTable 3 (as an average of the two devices for each polymer system).

TABLE 3 Monomers of Phosphorescent Luminesence Starting 10 V Luminance(Cd/m²) Example Polymer (Molar Ratio) Polymer Voltage (V) Initial After240 Hours Scheme 14 Ir(3-MA-PPy)(3-PrCO-PPy)₂ Not cross-linked 4 15601150 (A) 15 Ir(3-MA-PPy)₃ Cross-linked 6 1430 1350 — 16Ir(3-MA-PPy)(3-PrCO-PPy)₂/Ir(3-MA-PPy)₃(1/1) Cross-linked 5 1580 1420(B) 17 Ir(3-MOI-PPy)(3-PrCO-PPy)₂ Not cross-linked 6 1600 1280 (C) 18Ir(3-MOI-PPy)₂(3-PrCO-PPy)₂ Cross-linked 5 1510 1380 — 19IR(3-MOI-PPy)(3-PrCO-PPy)/Ir(3-MOI-PPy)₂(3- Cross-linked 5 1600 1450 (D)PrCO-PPy)(1/1) Scheme A

Scheme B

Scheme C

Scheme D

EXAMPLES 20 TO 23 AND COMPARATIVE EXAMPLE 3 Fabrication and Evaluationof Organic Light Emitting Devices Using Polymerizable Compositions

Phenylpyridine (PPy) and tris(acetylacetonato) iridium (III) (Ir(acac)₃)were allowed to react at 300° C. by a conventional method to synthesizea phosphorescent compound tris(phenylpyridine)iridium (III) (Ir(PPy)₃).

Electron transporting compound-added polymerizable luminescent compoundcompositions as 10 mass % chloroform solutions were prepared bycombining the phosphorescent polymerizable compounds synthesized inExamples 1 and 12, i.e., monofunctional Ir(3-MA-PPy)(3-PrCO-PPy)₂ andtrifunctional (3-MOI-PPy)₃, respectively, and a bifunctional electrontransporting compound: bisstyryl oxadiazole (BSODA), and a comparativeelectron transporting compound: oxadiazole (ODA) as shown in Table 4were prepared. After addition of AIBN (azobisbutyronitrile) as apolymerization initiator in an amount of 2 mass parts per 100 mass partsof the total amount of the monomers, each of the solutions was coated inan area of a size of 5 mm×5 mm by a spin coating method on an ITO anode(ITO-coated glass substrate) on which polyethylenedioxythiophene (PEDOT,manufactured by Bayer AG) had been preliminarily coated to a thicknessof 500 Angstroms. This was dried by heating at 60° C. for 2 hours topolymerize and cure each monomer and further dried at 80° C. underreduced pressure for 8 hours to form phosphorescent polymer layer havinga thickness of about 1,000 Angstroms on the PEDOT/ITO anode for eachcombination.

On each of the five types of (total ten) phosphorescentpolymer/PEDOT/ITO electrodes, a layer of Ag/Mg (mass ratio: 9/1) as acathode was formed to a thickness of about 1,000 Angstroms to fabricatefive types of (two for each type) organic light emitting devices. Tothese devices were attached lead wires in an argon atmosphere in a glovebox and the devices were sealed in a glass tube in an argon atmosphereand evaluated for light emitting properties in the same manner as inExamples 14 to 19.

TABLE 4 10 V Luminance Luminescence (Cd/m²) PhosphorescentCompound/Electron Starting After Transporting Compound (molar Voltage240 ratio) Polymer (V) Initial Hours Example 20 Ir(PPy)₃/BSODA (1/1)Crosslinked 6 1660 1120 Example 21 Ir(3-MA-PPy)(3-PrCO-PPy)₂/BSODA(1/1)Crosslinked 7 1480 1210 Example 22 Ir(3-MA-PPy)₃/ODA(1/1) Crosslinked 51380 1320 Example 23 Ir(3-MA-PPy)(3-PrCO-PPy)₂/ODA (1/1) Not 5 1510 1080crosslinked Comparative Ir(PPy)₃/ODA (1/1) Non- 5 1680 880 Example 3polymerized

EXAMPLE 25 Synthesis of a Polymerizable Compound Ir(MA-PPy)(PPy)₂

(1) The methoxy group of 3-MeO-PPy synthesized in the same manner as inExample 1 was hydrolyzed by a conventional method.

That is, as shown in Reaction Scheme below, 16.0 g (86.4 mmol) of3-MeO-PPy was dissolved in concentrated hydrochloric acid and stirred ina sealed vessel at 130° C. for 4 hours. After completion of thereaction, the reaction mixture was neutralized with an aqueous solutionof sodium hydrogen carbonate and the objective compound was extractedwith chloroform. Crystallization of the extract from a chloroform/hexanesolution afforded 10.4 g (60.7 mmol) of 2-(3-hydroxyphenyl)pyridine(3-HO-PPy) as colorless crystal. Identification was performed by ¹H-NMRand elementary analysis of C, H and N.

¹H-NMR (CDCl₃₁ ppm): δ 8.66 (d, 1H), 7.76 (t, 1H), 7.67 (d, 1H), 7.56(s, 1H), 7.40 (d, 1H), 7.30 (t, 1H), 7.26 (t, 1H), 6.88 (d, 1H), 2.08(br, 1H).

Elementary analysis Calcd: C, 77.17; H, 5.30; N, 8.18. Found: C, 76.81;H, 5.37; N, 8.11.

(2) The hydroxyl group of 3-HO-PPy was protected bytert-butyldimethylsilyl chloride (TBDMS-Cl) by a conventional method.

That is, as shown in the Reaction Scheme below, a solution of 8.6 g(50.2 mmol) of 3-HO-PPy, 10.2 g of imidazole and 11.3 g (75.0 mmol) oftert-butyldimethylchlorosilane in 200 ml of N,N-dimethylformamide wasallowed to react at room temperature for 4 hours. Purification of thereaction mixture using a silica gel column afforded 13.0 g (45.5 mmol)of 2-(3-tert-butyldimethylsilyloxyphenyl) pyridine (3-SiO-PPy) as acolorless transparent liquid. Identification was performed by elementaryanalysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 8.68 (d, 1H), 7.74 (t, 1H), 7.68 (d, 1H), 7.58(d, 1H), 7.48 (s, 1H), 7.32 (t, 1H), 7.22 (t, 1H), 6.89 (d, 1H), 1.01(s, 9H), 0.24 (s, 6H).

Elementary analysis Calcd: C, 71.53; H, 8.12; N, 4.91. Found: C, 71.08;H, 8.14; N, 4.88.

(3) The 3-SiO-PPy was allowed to react withdi(μ-chloro)tetrakis(2-phenylpyridine)diiridium (III) ([Ir(PPy)₂Cl]₂)synthesized by a conventional method in the presence of silver (I)trifluoromethanesulfonate (AgCF₃SO₃).

That is, as shown in the Reaction Scheme below, 2.70 g of AgCF₃SO₃ wasadded to a suspension of 5.71 g (20.0 mmol) of SiO-PPy and 5.37 g (5.0mmol) of [Ir(PPy)₂Cl]₂ in dry toluene and refluxed for 6 hours.Purification of the reaction mixture using a silica gel column and thendistilling off the solvent afforded 2.53 g (3.2 mmol) of(2-(3-tert-butyldimethylsilyloxyphenyl)pyridine) bis(2-phenylpyridine)iridium (III) (Ir(PPy)₂(3-SiO-PPy-)) as yellow powder. Identificationwas performed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 7.86 (d, 2H), 7.78 (d, 1H), 7.64 (d, 2H), 7.55(m, 6H), 7.16 (s, 1H), 6.85 (m, 9H), 6.60 (d, 1H), 6.45 (d, 1H).

Elementary analysis Calcd: C, 59.67; H, 4.88; N, 5.35. Found: C, 59.53;H, 4.89; N, 5.34.

(4) The silyl group of Ir(PPy)₂(3-SiO-PPy) was hydrolyzed by aconventional method.

That is, as shown in the Reaction Scheme below, 5.1 ml of a 1 M THFsolution of tetra-n-butylammonium fluoride (TBAF) was added to a THFsolution of 2.00 g (2.55 mmol) of Ir(PPy)₂(3-SiO-PPy) and the mixturewas allowed to react at room temperature for 30 minutes. Purification ofthe reaction mixture using a silica gel column and then distilling offthe solvent afforded 1.69 g (2.52 mmol) of (2-(3-hydroxyphenyl)pyridine)bis(2-phenylpyridine) iridium (III) (Ir (PPy)₂ (3-HO-PPy)).Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 7.87 (d, 2H), 7.78 (d, 1H), 7.6 (m, 9H), 6.85 (m,10H), 6.63 (d, 1H), 4.23 (s, 1H).

Elementary analysis Calcd: C, 59.09; H, 3.61; N, 6.26. Found: C, 58.64;H, 3.74; N, 6.17.

(5) As shown in the Reaction Scheme below, 0.25 g (2.4 mmol) ofmethacryloyl chloride was added to a solution of 1.34 g (2.0 mmol) ofIr(PPy)₂(3-HO-PPy) and 0.81 g (8.0 mmol) of triethylamine as a base indry THF under argon stream and the mixture was allowed to react at 20°C. for 5 hours. Triethylamine hydrochloride was filtered from thereaction mixture and purification of the filtrate using a silica gelcolumn followed by distilling of the solvent afforded 1.28 g (1.73 mmol)of (2-(3-methacryloyloxyphenyl)pyridine) bis(2-phenylpyridine) iridium(III) (Ir(3-MA-PPy)(PPy)₂). Identification was performed by elementaryanalysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 7.87 (d, 2H), 7.78 (d, 1H), 7.6 (m, 8H), 7.40 (s,1H), 6.8 (m, 10H), 6.59 (d, 1H), 6.35 (s, 1H), 5.74 (s, 1H), 2.08 (s,3H).

Elementary analysis Calcd: C, 60.15; H, 3.82; N, 5.69. Found: C, 59.85;H, 3.86; N, 5.66.

EXAMPLE 26 Synthesis of a Polymerizable Compound Ir(3-MOI-PPy)(PPy)₂

As shown in the Reaction Scheme below, 0.37 g (2.38 mmol) of2-methacryloyloxyethyl isocyanate (Trade name “Karenz MOI”, manufacturedby Showa Denko K. K., hereinafter sometimes referred to as “MOI”) wasadded to a solution of 1.34 g (2.0 mmol) of Ir(PPy)₂(3-HO-PPy)synthesized in the same manner as in Example 25, 9 mg of2,6-di-tert-butyl-4-methylphenol (BHT), and 13 mg of dibutyltin (IV)dilaurate (DBTL) in dry THF under argon stream and the mixture wasallowed to react at 50° C. for 1 hour. Purification of the reactionmixture using a silica gel column followed by distilling off the solventafforded 1.48 g (1.79 mmol) of(2-(3-((2-methacryloyloxyethyl)carbamoyloxy)phenyl)pyridine)bis(2-phenylpyridine) iridium (III) (Ir(PPy)₂ (3-MOI-PPy)).Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 7.87 (d, 2H), 7.80 (d, 1H), 7.6 (m, 8H), 7.42 (s,1H), 6.8 (m, 10H), 6.59 (d, 1H), 6.14 (s, 1H), 5.60 (s, 1H), 5.21 (br,1H), 4.28 (t, 2H), 3.57 (m, 2H), 1.96 (s, 3H).

Elementary analysis Calcd: C, 58.17; H, 4.03; N, 6.78. Found: C, 57.78;H, 4.02; N, 6.72.

EXAMPLE 27 Synthesis of a Polymerizable Compound Ir(4-MA-PPy)₂(PPy)

(1) 2-(4-Methoxyphenyl)pyridine (4-MeO-PPy) was synthesized by aconventional method.

That is, as shown in the Reaction Scheme below,(4-methoxyphenyl)magnesium bromide was synthesized from 22.4 g (120mmol) of 4-bromoanisole by a conventional method by using 3.4 g ofmagnesium (Mg) in dry tetrahydrofuran (THF) under argon stream and addedslowly into a solution of 15.8 g (100 mmol) of 2-bromopyridine and 1.8 gof (1,2-bis(diphenylphosphino)ethane)dichloronickel (II) (Ni(dppe)Cl₂)in dry THF and the mixture was refluxed for 1 hour. After adding 250 mlof an aqueous solution of 5% hydrochloric acid to the reaction mixture,the reaction mixture was washed with chloroform. The water layer wasneutralized with an aqueous solution of sodium hydrogen carbonate andthe objective compound was extracted with chloroform and the organiclayer was distilled off under reduced pressure. The distillateimmediately solidified at room temperature to obtain 15.1 g (81.5 mmol)of 2-(4-methoxy-phenyl)pyridine (4-MeO-PPy) as white solid.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.65 (d, 1H), 7.95 (d, 2H), 7.71 (t, 1H), 7.66(d, 1H), 7.16 (t, 1H), 7.00 (d, 2H), 3.86 (s, 3H).

Elementary analysis Calcd: C, 77.81; H, 5.99; N, 7.56. Found: C, 77.52;H, 6.10; N, 7.40.

(2) The methoxy group of 4-MeO-PPy was hydrolyzed by a conventionalmethod.

That is, as shown in Reaction Scheme below, 15.0 g (80.1 mmol) of4-MeO-PPy was dissolved in concentrated hydrochloric acid and stirred ina sealed vessel at 130° C. for 4 hours. After completion of thereaction, the reaction mixture was neutralized with an aqueous solutionof sodium hydrogen carbonate and the objective compound was extractedwith chloroform. Crystallization of the extract from a chloroform/hexanesolution afforded 10.0 g (58.5 mmol) of 2-(4-hydroxyphenyl)pyridine(4-HO-PPy) as colorless crystal. Identification was performed byelementary analysis of C, H and N, and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.63 (d, 1H), 7.82 (d, 2H), 7.74 (t, 1H), 7.65(d, 1H), 7.20 (t, 1H), 6.85 (d, 2H).

Elementary analysis Calcd: C, 77.17; H, 5.30; N, 8.18. Found: C, 76.91;H, 5.39; N, 8.02.

(3) 4-HO-PPy was allowed to react with sodium hexachloroiridaten-hydrate (Na₃IrCl₆.nH₂O) by a conventional method to synthesizedi(μ-chloro)tetrakis(2-(4-hydroxyphenyl)pyridine) diiridium (III)([Ir(4-HO-PPy)₂Cl]₂).

That is, as shown in the Reaction Scheme below, 10.0 g of Na₃IrCl₆.nH₂Owas dissolved in 400 ml of a 3:1 mixed solvent of 2-ethoxyethanol andwater and argon gas was blown therein for 30 minutes. Then 8.6 g (5.2mmol) of 4-HO-PPy was added and dissolved in the solution under argonstream, followed by reflux for 5 hours. After completion of thereaction, the solvent was distilled off and recrystallization of theresidue from ethanol afforded 5.88 g (5.18 mmol) of [Ir(4-HO-PPy)₂Cl]₂as reddish brown crystal. Identification was performed by elementaryanalysis of C, H and N and ¹H-NMR.

¹H-NMR (DMSO-d₆, ppm): δ 9.66 (d, 2H), 9.38 (d, 2H), 7.95 (m, 8H), 7.61(d, 2H), 7.54 (d, 2H), 7.38 (t, 2H), 7.26 (t, 2H), 6.33 (d, 2H), 6.28(d, 2H), 5.67 (s, 2H), 5.12 (s, 2H).

Elementary analysis Calcd: C, 46.52; H, 2.84; N, 4.93. Found: C, 46.33;H, 2.51; N, 4.76.

(4) [Ir(4-HO-PPy)₂Cl]₂ was allowed to react with 2-phenylpyridine (PPy)in the presence of silver (I) trifluoromethanesulfonate (AgCF₃SO₃) by aconventional method.

That is, as shown in the Reaction Scheme below, 1.98 g of AgCF₃SO₃ wasadded to a suspension of 3.98 g (3.5 mmol) of [Ir(4-HO-PPy)₂Cl]₂ and15.5 g (10.0 mmol) of PPy in dry toluene and the mixture was refluxedfor 6 hours. Purification of the reaction mixture using a silica gelcolumn followed by distilling off the solvent afforded 2.20 g (3.2 mmol)of bis(2-(4-hydroxyphenyl)pyridine)(2-phenylpyridine)iridium (III)(Ir(4-HO-PPy)₂(PPy)) as yellow powder. Identification was performed byelementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 7.88 (d, 1H), 7.78 (d, 2H), 7.6 (m, 9H), 6.85 (m,8H), 6.64 (d, 2H).

Elementary analysis Calcd: C, 57.71; H, 3.52; N, 6.12. Found: C, 57.46;H, 3.49; N, 5.99.

(5) As shown in the Reaction Scheme below, 0.50 g (4.8 mmol) ofmethacryloyl chloride was added to a solution of 1.37 g (2.0 mmol) ofIr(4-HO-PPy)₂(PPy) and 0.81 g (8.0 mmol) of triethylamine as a base indry THF under argon stream and the mixture was allowed to react at 20°C. for 5 hours. Triethylamine hydrochloride was filtered off from thereaction mixture and purification of the filtrate using a silica gelcolumn followed by distilling of the solvent afforded 1.55 g (1.88 mmol)of bis(2-(4-methacryloyloxyphenyl)pyridine) (2-phenylpyridine) iridium(III) (Ir(4-MA-PPy)₂(PPy)). Identification was performed by elementaryanalysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 7.87 (d, 1H), 7.78 (d, 2H), 7.6 (m, 9H), 6.8 (m,8H), 6.59 (s, 2H), 6.35 (s, 2H), 5.74 (s, 2H), 2.08 (s, 6H).

Elementary analysis Calcd: C, 59.84; H, 3.92; N, 5.11. Found: C, 59.95;H, 3.82; N, 5.04.

EXAMPLE 28 Synthesis of a Polymerizable Compound Ir(4-MOI-PPy)₂(PPy)

As shown in the Reaction Scheme below, 0.75 g (4.83 mmol) of2-methacryloyloxyethyl isocyanate (Trade name “Karenz MOI”, manufacturedby Showa Denko K. K., hereinafter sometimes referred to as “MOI”) wasadded to a solution of 1.37 g (2.0 mmol) of Ir(4-HO-PPy)₂(PPy)synthesized in the same manner as in Example 27, 18 mg of2,6-di-tert-butyl-4-methylphenol (BHT), and 26 mg of dibutyltin (IV)dilaurate (DBTL) in dry THF under argon stream and the mixture wasallowed to react at 50° C. for 1 hour. Purification of the reactionmixture using a silica gel column followed by distilling off the solventafforded 1.68 g (1.68 mmol) of bis(2-(4-((2-methacryloyloxyethyl)carbamoyloxy)phenyl)pyridine) (2-phenylpyridine) iridium (III)(Ir(4-MOI-PPy)₂(PPy)). Identification was performed by elementaryanalysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 7.85 (d, 1H), 7.81 (d, 2H), 7.6 (m, 9H), 6.8 (m,8H), 6.58 (d, 2H), 6.12 (s, 2H), 5.60 (s, 2H), 5.21 (br, 2H), 4.28 (t,4H), 3.58 (m, 4H), 1.96 (s, 6H).

Elementary analysis Calcd: C, 56.62; H, 4.25; N, 7.02. Found: C, 56.38;H, 4.02; N, 6.72.

EXAMPLE 29 Synthesis of Ir(3-MA-PPy) (PPy)₂ Polymer

In a reactor were charged 1.11 g (1.5 mmol) of Ir(3-MA-PPy) (PPy)₂complex synthesized in Example 25, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 10 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below).After completion of the reaction, the reaction mixture was dripped intoacetone to perform reprecipitation and the resultant polymer wasrecovered by filtration. A procedure of reprecipitation by dripping achloroform solution of the recovered polymer into methanol was furtherrepeated 2 times to purify the polymer, which was then recovered anddried in vacuum to afford 0.92 g of the objective Ir(3-MA-PPy)(PPy)₂polymer as powder. The elementary analysis of C, H, N of the obtainedpolymer indicated that the polymer had the same composition asIr(3-MA-PPy)(PPy)₂. The weight average molecular weight of the polymerwas 12,000 in terms of polystyrene (GPC measurement, eluent: THF).

EXAMPLE 30 Synthesis of Ir(3-MOI-PPy)(PPy)₂ Polymer

In a reactor were charged 1.11 g (1.5 mmol) of Ir(3-MOI-PPy) (PPy)₂complex synthesized in Example 26, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 10 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below).After completion of the reaction, the reaction mixture was dripped intoacetone to perform reprecipitation and the resultant polymer wasrecovered by filtration. A procedure of reprecipitation by dripping achloroform solution of the recovered polymer into methanol was furtherrepeated 2 times to purify the polymer, which was then recovered anddried in vacuum to afford 1.02 g of the objective Ir(3-MOI-PPy)(PPy)₂polymer as powder. The elementary analysis of C, H, N and Ir of theobtained polymer indicated that the polymer had substantially the samecomposition as Ir(3-MOI-PPy)(PPy)₂. The weight average molecular weightof the polymer was 20,000 in terms of polystyrene (GPC measurement,eluent: THF).

EXAMPLE 31 Synthesis of Ir(3-MA-PPy)(3-PrCO-PPy)₂ Polymer

In a reactor were charged 2.22 g (2.5 mmol) of Ir(3-MA-PPy)(3-PrCO-PPy)₂ complex synthesized in Example 1, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below).After completion of the reaction, the reaction mixture was dripped intoacetone to perform reprecipitation and the resultant polymer wasrecovered by filtration. A procedure of reprecipitation by dripping achloroform solution of the recovered polymer into methanol was furtherrepeated 2 times to purify the polymer, which was then recovered anddried in vacuum to afford 1.85 g of the objectiveIr(3-MA-PPy)(3-PrCO-PPy)₂ polymer as powder. The elementary analysis ofC, H, N of the obtained polymer indicated that the polymer had the samecomposition as Ir(3-MA-PPy)(3-PrCO-PPy)₂. The weight average molecularweight of the polymer was 8,000 in terms of polystyrene (GPCmeasurement, eluent: THF).

EXAMPLE 32 Synthesis of Ir(3-MA-PPy)₃ Polymer

In a reactor were charged 2.28 g (2.5 mmol) of the Ir(3-MA-PPy)₃ complexsynthesized in Example 12, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below). Asa result an insoluble polymer precipitated. The polymer was recovered byfiltration, washed with 100 ml of chloroform and then with 100 ml ofmethanol, and dried under vacuum to obtain 2.10 g of the objectiveIr(3-MA-PPy)₃ polymer as powder. Elementary analysis of C, H and N ofthe obtained polymer supported for its having substantially identicalcomposition with that of Ir(3-MA-PPy)₃. The polymer was deemed to have acrosslinked structure and was insoluble in most of common organicsolvents so that it was impossible to measure its molecular weight byGPC.

EXAMPLE 33 Synthesis of Ir(3-MOI-PPy) (3-PrCO-PPy)₂ Polymer

In a reactor were charged 2.43 g (2.5 mmol) ofIr(3-MOI-PPy)(3-PrCO-PPy)₂ complex synthesized in Example 3, 0.010 g(0.061 mmol) of 2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butylacetate and the atmosphere was exchanged with nitrogen. Thereafter, themixture was allowed to react at 80° C. for 10 hours (cf. Reaction Schemebelow). After completion of the reaction, the reaction mixture wasdripped into acetone to perform reprecipitation and the resultantpolymer was recovered by filtration. A procedure of reprecipitation bydripping a chloroform solution of the recovered polymer into methanolwas further repeated 2 times to purify the polymer, which was thenrecovered and dried in vacuum to afford 2.05 g of the objectiveIr(3-MOI-PPy) (3-PrCO-PPy)₂ polymer as powder. The elementary analysisof C, H, N of the obtained polymer supported for its havingsubstantially the same composition as that ofIr(3-MOI-PPy)(3-PrCO-PPy)₂. The weight average molecular weight of thepolymer was 18,000 in terms of polystyrene (GPC measurement, eluent:THF).

EXAMPLE 34 Synthesis of Ir(3-MOI-PPy)₂(3-PrCO-PPy) Polymer

In a reactor were charged 2.46 g (2.5 mmol) ofIr(3-MOI-PPy)₂(3-PrCO-PPy) complex synthesized in Example 13, 0.010 g(0.061 mmol) of 2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butylacetate and the atmosphere was exchanged with nitrogen. Thereafter, themixture was allowed to react at 80° C. for 10 hours (cf. Reaction Schemebelow). As a result an insoluble polymer precipitated. The polymer wasrecovered by filtration, washed with 100 ml of chloroform and then with100 ml of methanol, and dried under vacuum to obtain 2.21 g of theobjective Ir(3-MOI-PPy)₂(3-PrCO-PPy) polymer as powder. Elementaryanalysis of C, H and N of the obtained polymer supported for its havingsubstantially the same composition as that ofIr(3-MOI-PPy)₂(3-PrCO-PPy). The polymer was deemed to have a crosslinkedstructure and was insoluble in most of common organic solvents so thatit was impossible to measure its molecular weight by GPC.

EXAMPLE 35 Synthesis of Ir(3-MA-PPy) (3-PrCO-PPy)₂/Ir(3-MA-PPy)₃Copolymer

In a reactor were charged 1.11 g (1.25 mmol) of Ir(3-MA-PPy)(3-PrCO-PPy)₂ complex synthesized in Example 1, 1.14 g (1.25 mmol) ofIr(3-MA-PPy)₃ complex synthesized in Example 12, 0.010 g (0.061 mmol) of2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butyl acetate and theatmosphere was exchanged with nitrogen. Thereafter, the mixture wasallowed to react at 80° C. for 10 hours (cf. Reaction Scheme below). Asa result an insoluble polymer precipitated. The polymer was recovered byfiltration, washed with 100 ml of chloroform and then with 100 ml ofmethanol, and dried under vacuum to obtain 2.05 g of the objectiveIr(3-MA-PPy)(3-PrCO-PPy)₂/Ir(3-MA-PPy)₃ copolymer as powder. Elementaryanalysis of C, H and N of the obtained copolymer supported for thepolymerization of Ir(3-MA-PPy)(3-PrCO-PPy)₂ with Ir(3-MA-PPy)₃ in amolar ratio of 1:1. The copolymer was deemed to have a crosslinkedstructure and was insoluble in most of common organic solvents so thatit was impossible to measure its molecular weight by GPC.

EXAMPLE 36 Synthesis of Ir(3-MOI-PPy)(3-PrCO-PPy)₂/Ir(3-MOI-PPy)₂(3-PrCO-PPy) Copolymer

In a reactor were charged. 1.21 g (1.25 mmol) of Ir(3-MOI-PPy)(3-PrCO-PPy)₂ complex synthesized in Example 3, 1.23 g (1.25 mmol) ofIr(3-MOI-PPy)₂(3-PrCO-PPy) complex synthesized in Example 13, 0.010 g(0.061 mmol) of 2,2′-azobis(isobutyronitrile) (AIBN), and 30 ml of butylacetate and the atmosphere was exchanged with nitrogen. Thereafter, themixture was allowed to react at 80° C. for 10 hours (cf. Reaction Schemebelow). As a result an insoluble polymer precipitated. The polymer wasrecovered by filtration, washed with 100 ml of chloroform and then with100 ml of methanol, and dried under vacuum to obtain 2.18 g of theobjective Ir(3-MOI-PPy) (3-PrCO-PPy)₂/Ir(3-MOI-PPy)₂ (3-PrCO-PPy)copolymer as powder. Elementary analysis of C, H and N of the obtainedcopolymer supported for the polymerization of Ir(3-MOI-PPy)(3-PrCO-PPy)₂ with Ir(3-MOI-PPy)₂(3-PrCO-PPy) in a molar ratio of 1:1.The copolymer was deemed to have a crosslinked structure and wasinsoluble in most of common organic solvents so that it was impossibleto measure its molecular weight by GPC.

EXAMPLE 37 Synthesis of a Polymerizable Compound (8-nonen-2,4-dionato)bis(2-phenylpyridine) Iridium (III) (Hereinafter Abbreviated asIr(PPy)₂(1-Bu-acac))

As shown in the Reaction Scheme below,di(μ-chloro)tetrakis(2-phenylpyridine) diiridium (III) (hereinafterabbreviated as [Ir(PPy)₂Cl]₂) synthesized by a conventional method and8-nonen-2,4-dione synthesized by the known method (H. Gerlach et al.,Helv. Chim. Acta, 60, 638 (1977)) were allowed to react to synthesizeIr(PPy)₂ (1-Bu-acac).

That is, 261 mg (0.24 mmol) of [Ir(PPy)₂Cl]₂ was suspended in 30 ml ofnitrogen-purged methanol and 87 mg (0.56 mmol) of 8-nonen-2,4-dione and76 mg (0.75 mmol) of triethylamine were added thereto, and the obtainedmixture was heated under reflux in an oil bath for 3 hours. The obtainedpale yellow reaction mixture was cooled to room temperature andconcentrated by using a rotary evaporator. Then, 200 ml of dilutehydrochloric acid solution and 50 ml of chloroform were added to thereaction mixture and the obtained mixture was stirred vigorously. Thechloroform layer was separated and dried over magnesium sulfate and thesolvent was distilled off under reduced pressure. The obtained yellowresidue was dissolved in dichloromethane and the solution was subjectedto silica gel column chromatography to separate a pale yellow mainproduct. A solution of the product was concentrated under reducedpressure and then a small amount of hexane was added thereto, followedby cooling to −20° C. to obtain 270 mg (0.41 mmol) of the objectiveIr(PPy)₂(1-Bu-acac) as pale yellow crystal (yield: 85%). Identificationwas performed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 8.49 (d, J=5.7 Hz, 2H, PPy), 7.83 (t, J=7.8 Hz,2H, PPy), 7.70 (m, 2H, PPy), 7.54 (t, J=6.8 Hz, 2H, PPy), 7.10 (m, 2H,PPy), 6.80 (t, J=7.3 Hz, 2H, PPy), 6.68 (m, 2H, PPy), 6.35 (d, J=6.2 Hz,1H, PPy), 6.25 (d, J=6.2 Hz, 1H, PPy), 5.61 (m, 1H, —CH═CH₂), 5.19 (s,1H, diketonate-methine), 4.86 (m, 2H, —CH═CH₂), 1.99 (t, J=7.3 Hz, 2H,methylene), 1.79 (s, 3H, CH₃), 1.72 (m, 2H, methylene), 1.38 (m, 2H,methylene).

Elementary analysis Calcd: C, 56.95; H, 4.47; N, 4.28. (C₃₁H₂₉IrN₂O₂)Found: C, 55.84; H, 4.32; N, 3.97.

EXAMPLE 38 Synthesis of a Polymerizable Compound[6-(4-vinylphenyl)-2,4-hexanedionato]bis(2-phenylpyridine)iridium (III)(Hereinafter Abbreviated as Ir(PPy)₂[1-(St-Me)-acac])

(1) As shown in the Reaction Scheme below, acetylacetone and4-vinylbenzyl chloride were allowed to react to synthesize6-(4-vinylphenyl)-2,4-hexanedione

That is, 1.23 g (60% in oil) (31 mmol) of sodium hydride was weighed ina nitrogen atmosphere and 60 ml of dry tetrahydrofuran (hereinafterabbreviated as THF) was added thereto and the mixture was cooled to 0°C. in an ice bath. To the suspension was dripped a mixed solution of 2.5g 124 mmol) of acetylacetone and 1 ml of hexamethyl phosphoric triamideto produce colorless precipitate. After stirring the mixture at 0° C.for 10 minutes, 17.5 ml (28 mmol) of a hexane solution (1.6 M) ofn-butyllithium was dripped therein to dissolve the precipitate and themixture was further stirred at 0° C. for 20 minutes. To the obtainedpale yellow solution was dripped 4.0 g (26 mmol) of 4-vinylbenzylchloride and the reaction mixture was warmed back to room temperatureand stirred for 20 minutes. Then, dilute hydrochloric acid was addedthereto to render the water layer acidic. The organic layer was washedwith saturated sodium chloride solution and dried over magnesiumsulfate, and the solvent was distilled off by using a rotary evaporator.The obtained reaction mixture was charged in a silica gel column anddeveloped with a mixed solvent of hexane/dichloromethane (1:1 (byvolume)) to separate a main product. Distilling off the solvent from theobtained solution afforded 3.0 g (14 mmol) of the objective6-(4-vinylphenyl)-2,4-hexanedione as a brown liquid. Yield was 56%.Identification was performed by elementary analysis of C and H, and¹H-NMR.

¹H-NMR (CDCl₃₁ ppm):

enol; δ 7.33 (d, J=8.1 Hz, 2H, aromatic), 7.14 (d, J=8.4 Hz, 2H,aromatic), 6.68 (dd, J=8.1 Hz, 1H, vinylic), 5.70 (d, J=17.0 Hz, 1H,vinylic), 5.46 (s, 1H, diketonate-methine), 5.20 (d, J=11.1 Hz, 1H,vinylic), 2.91 (t, J=5.7 Hz, 2H, methylene), 2.58 (t, J=7.3 Hz, 2H,methylene), 2.03 (s, 3H, methyl).

keto; δ 7.33 (d, J=8.1 Hz, 2H, aromatic), 7.14 (d, J=8.4 Hz, 2H,aromatic), 6.68 (dd, J=8.1 Hz, 1H, vinylic), 5.70 (d, J=17.0 Hz, 1H,vinylic), 5.20 (d, J=11.1 Hz, 1H, vinylic), 3.53 (s, 2H, C(═O)CH₂C(═O)),2.89 (m, 4H, ethylene), 2.19 (s, 3H, methyl). enol:keto=6:1.

Elementary analysis Calcd: C, 77.75; H, 7.46. (C₁₄H₉O₂) Found: C, 77.49;H, 7.52.

(2) As shown in the Reaction Scheme below,6-(4-vinylphenyl)-2,4-hexanedione thus obtained and [Ir(PPy)₂Cl]₂synthesized by a conventional method were allowed to react to synthesizeIr(PPy) 2 [1-(St-Me)-acac].

That is, to a solution of 342 mg (0.32 mmol) of [Ir(PPy)₂Cl]₂, 158 mg(1.5 mmol) of sodium carbonate and 5 mg (0.023 mmol) of2,6-di-tert-butyl-4-methylphenol in 5 ml of N,N-dimethylformamide(hereinafter, abbreviated as DMF) was added 210 mg (0.97 mmol) of6-(4-vinylphenyl)-2,4-hexanedione and the mixture was heated at 65° C.with stirring. Then, the reaction mixture was cooled to room temperatureand dilute hydrochloric acid solution was added thereto, followed byextracting a component having a pale yellow color with chloroform. Afterdistilling off the solvent by using a rotary evaporator, the residue wasdissolved in a small amount of dichloromethane and subjected to silicagel column chromatography (eluent: dichloromethane) to separate a yellowmain product. The solution was concentrated to dryness under reducedpressure and dichloromethane/hexane mixed solvent was added to theresidue to perform recrystallization at −20° C., which afforded 354 mg(0.49 mmol) of the objective Ir(PPy)₂[1-(St-Me)-acac] as pale yellowcrystal. Yield: 78%. Identification was performed by elementary analysisof C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.47 (d, J=5.7 Hz, 1H, PPy), 8.21 (d, J=5.7 Hz,1H, PPy), 7.9-7.5 (m, 6H, PPy), 7.18 (d, J=8.1 Hz, 2H, stylyl-aromatic),7.00 (m, 2H, PPy), 6.89 (d, J=8.1 Hz, 2H, stylyl-aromatic), 6.75 (m, 5H,PPy and vinylic), 6.28 (t, J==7.3 Hz, 2H, PPy), 7.67 (d, J=17.6 Hz, 1H,vinylic), 5.19 (d, J=9.5 Hz, 1H, vinylic), 5.17 (s, 1H,diketonate-methine), 2.60 (t, J=7.3 Hz, 2H, ethylene), 2.36 (m, 2H,ethylene), 1.75 (s, 3H, methyl).

Elementary analysis Calcd: C, 60.40; H, 4.36; N, 3.91. (C₃₆H₃₁IrN₂O₂)Found: C, 61.35; H, 4.34; N, 3.83.

EXAMPLE 39 Synthesis of a Polymerizable Compound(9-acryloyloxy-2,4-nonanedionato)bis(2-phenylpyridine)iridium (III)(Hereinafter Abbreviated as Ir(PPy)₂[1-(A-Bu)-acac])

(1) As shown in the Reaction Scheme below,(9-hydroxy-2,4-nonanedionato)bis(2-phenylpyridine)iridium (III)(hereinafter abbreviated as Ir(PPy)₂[1-(OH-Bu)-acac]) was synthesized bya conventional method.

That is, to a solution of 167 mg (0.276 mmol) of Ir(PPy)₂ (1-Bu-acac)synthesized in the same manner as in Example 37 in 10 ml of THF wasdripped 1.0 ml (0.5 mmol) of 0.5M THF solution of9-borabicyclo[3.3.1]nonane (hereinafter abbreviated as 9-BBN) and thesolution was heated under reflux for 25 minutes. Then, to the reactionmixture were added 0.2 ml (0.60 mmol) of a 3M aqueous NaOH solution and0.060 ml (0.62 mmol) of a 35% H₂O₂ solution in the order cited, and themixture was stirred at room temperature for 12 hours. Then, 20 ml ofwater was added thereto and the mixture was concentrated by using arotary evaporator. After adding chloroform and well shaking, the organiclayer was concentrated to dryness under reduced pressure. The obtainedyellow solid was dissolved in a small amount of dichloromethane and thesolution was charged in a silica gel column followed by flowingdichloromethane therethrough to remove eluted impurities. Subsequently,flowing a dichloromethane/ethyl acetate mixed solvent of 1:1 (by volumeratio) resulted in elution of a pale yellow complex, which was recoveredand dried under reduced pressure, followed by recrystallization of theresidue from dichloromethane/hexane mixed solution at −20° C. to obtain23 mg (0.034 mmol) of Ir(PPy)₂[1-(OH-Bu)-acac] as pale yellow solid.Yield: 13%. Identification was performed by elementary analysis of C, Hand N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): 8.50 (d, J=5.9 Hz, 2H, PPy), 7.82 (t, J=7.0 Hz, 2H,PPy), 7.72 (t, J=7.3 Hz, 2H, PPy), 7.55 (t, J=7.0 Hz, 2H, PPy), 7.12 (t,J=5.9 Hz, 2H, PPy), 6.81 (t, J=7.6 Hz, 2H, PPy), 6.69 (t, J=7.3 Hz, 2H,PPy), 6.31 (d, J=5.9 Hz, 1H, PPy), 6.26 (d, J=5.9 Hz, 1H, PPy), 5.19 (s,1H, diketonate-methine), 3.44 (t, J=7.0 Hz, 2H, CH₂OH), 1.98 (t, J=7.0Hz, 2H, methylene), 1.79 (s, 3H, methyl), 1.34 (m, 4H, methylene), 1.05(m, 2H, methylene).

Elementary analysis Calcd: C, 55.42; H, 4.65; N, 4.17. (C₃₁H₃₁IrN₂O₃)Found: C, 55.76; H, 4.71; N, 4.19.

(2) As shown in the Reaction Scheme below, Ir(PPy)₂[1-(OH-Bu)-acac] andacryloyl chloride were allowed to react to synthesizeIr(PPy)₂[1-(A-Bu)-acac].

That is, to a solution of 95 mg (0.14 mmol) of Ir(PPy)₂[1-(OH-Bu)-acac]in 10 ml of dichloromethane was added 0.10 ml (0.72 mmol) oftriethylamine. To this solution was added 0.060 ml (0.74 mmol) ofacryloyl chloride and the mixture was stirred at room temperature for 30minutes. Then, after adding 1 ml of methanol to the mixture, the solventwas distilled under reduced pressure and the residue was passed througha silica gel column (eluent: dichloromethane) and an initially elutedyellow solution was separated and concentrated to dryness under reducedpressure. Recrystallization of the residue from dichloromethane/hexanemixed solvent at −20° C. afforded 99 mg (0.14 mmol) of the objectiveIr(PPy)₂[1-(A-Bu)-acac] as pale yellow solid. Yield: 96%. Identificationwas performed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.50 (d, J=5.9 Hz, 2H, PPy), 7.80 (m, 4H, PPy),7.51 (t, J=7.3 Hz, 2H, PPy), 7.18 (t, J=5.9 Hz, 2H, PPy), 6.84 (t, J=7.3Hz, 2H, PPy), 6.70 (t, J=7.6 Hz, 2H, PPy), 6.25 (m, 3H, PPy+vinylic),6.12 (dd, J=15.6, 9.3 Hz, 1H, vinylic), 5.75 (d, J=9.3 Hz, 1H, vinylic),5.17 (s, 1H, diketonate-methine), 4.05 (t, J=7.0 Hz, 2H, —COOCH₂—), 1.84(t, J=7.0 Hz, 2H, methylene), 1.80 (s, 3H, methyl), 1.34 (m, 4H,methylene), 1.06 (m, 2H, methylene).

Elementary analysis Calcd: C, 56.26; H, 4.58; N, 3.86. (C₃₄H₃₃IrN₂O₄)Found: C, 56.55; H, 4.53; N, 3.60.

EXAMPLE 40 Synthesis of a Polymerizable Compound{1-[4-(2-methacryloyloxy)ethylcarbamoyloxyphenyl]-3-phenyl-1,3-propane-dionato]bis(2-phenylpyridine)iridium (III) (Hereinafter Abbreviated as Ir(PPy)₂ (MOI-Ph-acac))

(1) As shown in the Reaction Scheme below,di(1-chloro)tetrakis(2-phenylpyridine) diiridium (III) ([Ir(PPy)₂Cl]₂)synthesized by a conventional method and p-hydroxy-dibenzoylmethanesynthesized by referencing the known method (M. Cushman et al.,Tetrahedron Lett., 31, 6497 (1990)) were allowed to react to synthesize[1-(4-hydroxyphenyl)-3-phenyl-1,3-propane-dionato]bis(2-phenylpyridine)iridium(III) (hereinafter abbreviated as Ir(PPy)₂(OH-Ph-acac)).

That is, 112 mg (0.10 mmol) of [Ir(PPy)₂Cl]₂, 64 mg (0.60 mmol) ofsodium carbonate and 76 mg (0.32 mmol) of p-hydroxydibenzoylmethane weredissolved in 10 ml of DMF and the solution was heated at 60° C. for 0.5hour with stirring. The obtained reaction mixture was poured into 100 mlof dilute hydrochloric acid solution and the iridium complex wasextracted with chloroform. The chloroform was distilled off by using arotary evaporator and the residue was dissolved in a small amount ofdichloromethane and charged in a silica gel column. Development with amixed solvent of dichloromethane/acetone of 30:10 (by volume ratio)resulted in elution of a component having an orange color, which wasrecovered and concentrated to dryness under reduced pressure. Theobtained solid was dissolved in a small amount of diethyl ether andhexane was added thereto. The precipitate was collected by filtrationand dried under reduced pressure to obtain 111 mg (0.15 mmol) of theobjective Ir(PPy)₂(OH-Ph-acac) as orange solid. Yield: 72%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.58 (d, 2H, PPy), 7.9-6.7 (m, 21H, PPy+phenyl),6.52 (s, 1H, diketonate-methine), 6.37 (d, 2H, PPy), 4.91 (s, 1H, OH).

Elementary analysis Calcd: C, 60.07; H, 3.68; N, 3.79. (C₃₁H₂₇IrN₂O₃)Found: C, 60.77; H, 3.75; N, 3.62.

(2) As shown in the Reaction Scheme below, the obtainedIr(PPy)₂(OH-Ph-acac) and 2-methacryloyloxyethyl isocyanate (Trade name“Karenz MOI”, manufactured by Showa Denko K. K., hereinafter sometimesreferred to as “MOI”) were allowed to react to synthesizeIr(PPy)₂(MOI-Ph-acac).

That is, to a solution of 110 mg (0.15 mmol) of Ir(PPy)₂(OH-Ph-acac) in50 ml of toluene were added 5 mg (0.023 mmol) of2,6-di-tert-butyl-4-methylphenol (hereinafter abbreviated as BHT), 32 mg(0.051 mmol) of dibutyltin (IV) dilaurate (hereinafter abbreviated asDBTL) and 121 mg (0.78 mmol) of MOI and the mixture was heated at 70° C.for 6 hours with stirring. The obtained reaction mixture was air-cooledto room temperature and charged in a silica gel column, followed bydevelopment of the column with a mixed solvent ofdichloromethane/acetone of 20:1 (by volume ratio), resulting in elutionof an orange-colored compound. The solution containing the compound wasconcentrated to dryness under reduced pressure by using a rotaryevaporator and the obtained solid was dissolved in a small amount ofdichloromethane. Slowly adding hexane to the dichloromethane solutionresulted in deposition of an orange-colored precipitate, which wascollected by filtration and dried under reduced pressure to obtain 100mg (0.11 mmol) of the objective Ir(PPy)₂(MOI-Ph-acac) as orange-coloredsolid. Yield: 75%. Identification was performed by elementary analysisof C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.60 (d, 2H, PPy), 7.9-6.7 (m, 21H, PPy andphenyl), 6.56 (s, 1H, diketonate-methine), 6.39 (d, 2H, PPy), 6.18 (s,1H, olefinic), 5.65 (s, 1H, olefinic), 5.29 (s, 1H, NH), 4.31 (t, 2H,ethylene), 3.59 (t, 2H, ethylene), 2.00 (s, 3H, methyl).

Elementary analysis Calcd: C, 59.05; H, 4.05; N, 4.70. (C₄₄H₃₁IrN₃O₆)Found: C, 59.79; H, 4.05; N, 4.64.

EXAMPLE 41 Synthesis of a Polymerizable Compound[6-(4-methacryloyloxyphenyl)-2,4-hexanedionato]bis(2-phenylpyridine)iridium(III) (Hereinafter Abbreviated as Ir(PPy)₂[1-(MA-Ph-Me)-acac])

(1) As shown in the Reaction Scheme below, acetylacetone and4-benzyloxybenzyl iodide synthesized by the known method (C. Cativiela,et al., J. Org. Chem., 60, 3074 (1995)) were allowed to react tosynthesize 6-(4-benzyloxyphenyl)-2,4-hexanedione.

That is, 0.30 g (60% in oil) (7.5 mmol) of sodium hydride was weighed ina nitrogen atmosphere and 20 ml of THF was added thereto and the mixturewas cooled to 0° C. in an ice bath. To the suspension was dripped amixed solution of 0.75 g (7.5 mmol) of acetylacetone and 0.5 ml ofhexamethyl phosphoric triamide to produce colorless precipitate. Afterstirring the mixture at 0° C. for 10 minutes, 4.6 ml (7.5 mmol) of ahexane solution (1.6 M) of n-butyllithium was dripped therein todissolve the precipitate and the mixture was further stirred at 0° C.for 20 minutes. To the obtained pale yellow transparent solution wasdripped a solution of 2.28 g (7.0 mmol) of 4-benzyloxybenzyl iodide in10 ml of THF. After stirring the reaction mixture at room temperaturefor 1 hour, it was cooled again to 0° C. Then, dilute hydrochloric acidwas added thereto to neutralize it. After washing the organic layer witha saturated aqueous solution of sodium chloride, the solvent wasdistilled off by using a rotary evaporator. The residue was passedthrough a silica gel column (eluent: a mixed solvent ofdichloromethane/hexane of 1:1 (by volume ratio)) to separate a mainproduct. Separation of this and concentration to dryness under reducedpressure afforded 1.31 g (4.4 mmol) of the objective6-(4-benzyloxyphenyl)-2,4-hexanedione as pale yellow solid. Yield: 63%.Identification was performed by elementary analysis of C and H, and¹H-NMR.

¹H-NMR (CDCl₃, ppm):

enol: δ 7.5-6.8 (m, 9H, aromatic), 5.46 (s, 1H, enol-methine), 5.04 (s,2H, —O—CH₂—), 2.88 (t, J=7.6 Hz, 2H, ethylene), 2.55 (t, J=8.4 Hz, 2H,ethylene), 2.04 (s, 3H, methyl).

keto; δ 7.5-6.8 (m, 9H, aromatic), 5.04 (s, 2H, —O—CH₂—), 3.53 (s, 2H,C(═O)CH₂C(═O)), 2.84 (m, 4H, ethylene), 2.19 (s, 3H, methyl).

enol:keto=5:1.

Elementary analysis Calcd: C, 77.00; H, 6.86. (C₁₉H₂₀O₃) Found: C,77.46; H, 6.77.

(2) As shown in the Reaction Scheme below, the obtained6-(4-benzyloxyphenyl)-2,4-hexanedione was hydrogenated to produce6-(4-hydroxyphenyl)-2,4-hexanedione.

That is, 1.5 g of Pd-activated carbon (10%) was weighed in a nitrogenatmosphere and 20 ml of dichloromethane and 1.31 g (4.4 mmol) of6-(4-benzyloxyphenyl)-2,4-hexanedione were added thereto. The atmospherein the reaction system was exchanged with hydrogen at 1 atm and stirredat room temperature for 11 hours. The obtained reaction mixture wasfiltered to remove insoluble matter and the solvent was distilled offunder reduced pressure. The residue was charged in a silica gel columnand developed first with dichloromethane to remove byproducts.Subsequently, a solution containing a compound eluted from the columnwith a mixed solvent of 1:1 (by volume ratio) acetone/hexane wasconcentrated to dryness under reduced pressure to obtain 0.70 g (3.4mmol) of the objective 6-(4-hydroxyphenyl)-2,4-hexanedione as paleyellow solid. Yield: 77%. Identification was performed by elementaryanalysis of C and H, and ¹H-NMR.

¹H-NMR (CDCl₃, ppm):

enol: δ 7.04 (d, J=8.4 Hz, 2H, aromatic), 6.65 (d, J=8.4 Hz, 2H,aromatic), 5.55 (br, 1H, OH), 5.47 (s, 1H, enol-methine), 2.86 (t, J=7.3Hz, 2H, ethylene), 2.55 (t, J=7.3 Hz, 2H, ethylene), 2.04 (s, 3H,methyl).

keto: δ 7.04 (d, J=8.4 Hz, 2H, aromatic), 6.65 (d, J=8.4 Hz, 2H,aromatic), 5.55 (br, 1H, OH), 3.55 (s, 2H, C(═O)CH₂C(═O)), 2.83 (m, 4H,ethylene), 2.19 (s, 3H, methyl).

enol:keto ˜5:1.

Elementary analysis Calcd: C, 69.88; H, 6.84. (C₁₂H₁₄O₃) Found: C,69.67; H, 6.79.

(3) As shown in the Reaction Scheme below, the obtained6-(4-hydroxyphenyl)-2,4-hexanedione was allowed to react withdi(μ-chloro)tetrakis(2-phenylpyridine) diiridium (III) ([Ir(PPy)₂Cl]₂)synthesized by a conventional method to synthesize[6-(4-hydroxyphenyl)-2,4-hexanedionato]bis(2-phenylpyridine)iridium(III) (hereinafter abbreviated as Ir(PPy)₂[1-(OH-Ph-Me)-acac]).

That is, to a mixture of 71 mg (0.066 mmol) of [Ir(PPy)₂Cl]₂ and 47 mg(0.44 mmol) of sodium carbonate was added a solution of 41 mg (0.20mmol) of 6-(4-hydroxyphenyl)-2,4-hexanedione in 5 ml of DMF and themixture was heated at 65° C. for 1 hour with stirring. To the reactionmixture was added dilute hydrochloric acid and chloroform and themixture was well shaken. The separated organic layer was dried overmagnesium sulfate and the solvent was distilled off under reducedpressure. The residue was passed through a silica gel column (eluent: amixed solvent of 1:1 (by volume ratio) hexane/ethyl acetate) and asolution having a pale yellow color that eluted next to a small amountof pale yellow byproduct was recovered and concentrated to dryness underreduced pressure. The obtained solid was dissolved in a small amount ofdichloromethane. Addition of hexane to the solution and cooling it to−20° C. afforded 86 mg (0.12 mmol) of the objectiveIr(PPy)₂[1-(OH-Ph-Me)acac] as pale yellow solid. Yield: 92%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.48 (d, J=6.2 Hz, 1H, PPy), 8.23 (d, J=5.9 Hz,1H, PPy), 7.9-7.6 (m, 4H, PPy), 7.53 (t, J=7.3 Hz, 2H, PPy), 7.11 (t,J=7.0 Hz, 1H, PPy), 6.99 (t, J=7.0 Hz, 1H, PPy), 6.8-6.4 (m, 8H,PPy+C₆H₄OH), 6.27 (t, J=8.1 Hz, 2H, PPy), 5.18 (s, 1H,diketonate-methine), 5.10 (br, 1H, OH), 2.54 (t, J=7.0 Hz, 2H,methylene), 2.31 (m, 2H, methylene), 1.75 (s, 3H, methyl).

Elementary analysis Calcd: C, 57.86; H, 4.14; N, 3.97. (C₃₄H₂₉IrN₂O₃)Found: C, 58.03; H, 4.11; N, 3.86.

(4) As shown in the Reaction Scheme below, theIr(PPy)₂[1-(OH-Ph-Me)acac] was allowed to react with methacryloylchloride to synthesize Ir(PPy)₂[1-(MA-Ph-Me)acac].

That is, in a nitrogen atmosphere, 169 mg (0.24 mmol) ofIr(PPy)₂[1-(OH-Ph-Me)acac] was dissolved in 10 ml of dichloromethane and0.30 ml (2.2 mmol) of triethylamine was added to the solution. Additionof 0.060 ml (0.61 mmol) of methacryloyl chloride to the obtainedsolution rapidly produced a product. After further adding a small amountof methanol to the solution, the solvent was distilled off under reducedpressure. The residue was passed through a silica gel column with usinga mixed solvent of hexane/dichloromethane/acetone (10:10:1 (by volumeratio)) to separate a main product having a yellow color. Afterdistilling off the solvent under reduced pressure, recrystallization ofthe residue from a mixed solvent of dichloromethane/hexane afforded 141mg (0.18 mmol) of the objective Ir(PPy)₂[1-(MA-Ph-Me)acac] as yellowsolid. Yield: 76%. Identification was performed by elementary analysisof C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.48 (d, J=5.1 Hz, 1H, PPy), 8.27 (d, J=5.9 Hz,1H, PPy), 7.9-7.5 (m, 6H, PPy), 7.12 (t, J=7.0 Hz, 1H, PPy), 7.04 (t,J=−7.0 Hz, 1H, PPy), 6.9-6.6 (m, 8H, aromatic), 6.33 (s, 1H, olefinic),6.27 (d, J=7.6 Hz, 2H, PPy), 5.74 (s, 1H, olefinic), 5.17 (s, 1H,diketonate-methine), 2.61 (t, J=7.0 Hz, 2H, ethylene), 2.34 (m, 2H,ethylene), 2.07 (s, 3H, methacryl-methyl), 1.76 (s, 3H,diketonate-methyl).

Elementary analysis Calcd: C, 58.98; H, 4.30; N, 3.62. (C₃₁H₃₃IrN₂O₄)Found: C, 58.69; H, 4.17; N, 3.81.

EXAMPLE 42 Synthesis of a Polymerizable Compound(1-methacryloyloxy-2,4-pentanedionato)bis(2-phenylpyridine)iridium (III)(Hereinafter Abbreviated as Ir(PPy)₂(1-MA-acac))

(1) As shown in the Reaction Scheme below,di(1-chloro)tetrakis(2-phenylpyridine) diiridium (III) ([Ir(PPy)₂Cl]₂)synthesized by a conventional method and(1-tert-butyldimethylsilyloxy)-2,4-pentanedione synthesized byreferencing the known method (EP Patent No. 0514217) were allowed toreact to synthesize(1-hydroxy-2,4-pentanedionato)bis(2-phenyl-pyridine)iridium (III)(hereinafter abbreviated as Ir(PPy)₂(1-OH-acac)).

That is, to a solution of 492 mg (0.46 mmol) of [Ir(PPy)₂Cl]₂ and 139 mg(1.31 mmol) of sodium carbonate in 10 ml of DMF was added 321 mg (1.39mmol) of 1-(tert-butyldimethylsilyloxy)-2,4-pentandione(1-TBDMSO-2,4-pentadione) and the mixture was heated at 70° C. for 1hour with stirring. The reaction mixture was cooled to room temperatureand 100 ml of a saturated aqueous solution of ammonium chloride and 50ml of chloroform were added thereto, and well shaken. The organic layerwas dried over magnesium sulfate and the solvent was distilled off underreduced pressure. The residue was passed through a silica gel columnwith dichloromethane as an eluent to obtain a yellow solution. Thissolution was concentrated to dryness under reduced pressure to obtainyellow solid, which was dissolved in 20 ml of THF and 0.46 ml (0.46mmol) of a 1.0 M THF solution of tetra-n-butylammonium fluoride(hereinafter abbreviated as Bu^(n) ₄NF) was dripped thereto whilevigorously stirring the solution. The reaction mixture was stirred atroom temperature for 0.5 hour and then the solvent was distilled offunder reduced pressure. The residue was passed through a silica gelcolumn (eluent: a mixed solvent of hexane/dichloromethane/acetone (1:3:1(by volume ratio)) and the eluted yellow-colored main product wasrecovered and dried under reduced pressure. Recrystallization of theobtained crude product from a mixed solvent of dichloromethane/hexaneafforded 389 mg (0.63 mmol) of the objective Ir(PPy)₂(1-OH-acac) asyellow solid. Yield: 69%. Identification was performed by elementaryanalysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.48 (d, J=5.7 Hz, 1H, PPy), 8.42 (d, J=5.7 Hz,1H, PPy), 7.86 (m, 2H, PPy), 7.74 (t, J=7.6 Hz, 2H, PPy), 7.54 (t, J=5.9Hz, 2H, PPy), 7.14 (t, J=5.9 Hz, 2H, PPy), 6.82 (t, J=7.3 Hz, 2H, PPy),6.69 (m, 2H, PPy), 6.28 (d, J=6.8 Hz, 1H, PPy), 6.23 (d, J=6.5 Hz, 1H,PPy), 5.17 (s, 1H, diketonate-methine), 3.88 (dd, J=8.1, 5.4 Hz, 1H,—CHH′—O—), 3.78 (dd, J=8.1, 4.3 Hz, 1H, —CHH′—O—), 3.10 (t, J=4.6 Hz,1H, OH), 1.82 (s, 3H, methyl).

Elementary analysis Calcd: C, 52.67; H, 3.77; N, 4.55. (C₂₇H₂₃IrN₂O₃)Found: C, 52.45; H, 3.68; N, 4.79.

(2) As shown in the Reaction Scheme below, the obtainedIr(PPy)₂(1-OH-acac) and methacryloyl chloride were allowed to react tosynthesize Ir(PPy)₂ (1-MA-acac).

That is, to a solution of 200 mg (0.32 mmol) of Ir(PPy)₂(1-OH-acac) in15 ml of dichloromethane were added 0.25 ml (1.8 mmol) of triethylamineand 0.20 ml (2.0 mmol) of methacryloyl chloride and the mixture wasstirred at room temperature for 1 hour. Then, the reaction mixture waswashed with 20 ml of an aqueous solution of sodium carbonate and thesolvent was distilled off under reduced pressure. The residue wasdissolved again in dichloromethane and the solution was charged to theupper part of a silica gel column and developed with a mixed solvent ofhexane/dichloromethane/acetone of 2:4:1 (by volume ratio). The yellowsolution initially obtained was recovered and dried under reducedpressure to obtain 165 mg (0.24 mmol) of the objectiveIr(PPy)₂(1-MA-acac) as yellow solid. Yield: 74%. Identification wasperformed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ8.53 (d, J=5.7 Hz, 1H, PPy), 8.48 (d, J=5.4 Hz,1H, PPy), 7.84 (d, J=7.8 Hz, 2H, PPy), 7.73 (t, J=7.0 Hz, 2H, PPy), 7.53(t, J=6.8 Hz, 2H, PPy), 5.14 (m, 2H, PPy), 6.79 (m, 2H, PPy), 6.69 (m,2H, PPy), 6.29 (d, J=7.6 Hz, 1H, PPy), 6.23 (d, J=7.6 Hz, 1H, PPy), 6.04(s, 1H, olefinic), 5.51 (s, 1H, olefinic), 5.31 (s, 1H,diketonate-methine), 4.38 (d, J=15.4 Hz, 1H, —CHH′—OC(═O)—), 4.27 (d,J=14.9 Hz, 1H, —CHH′—OC(═O)—), 1.87 (s, 3H, methacryl-methyl), 1.82 (s,3H, diketonate-methyl).

Elementary analysis Calcd: C, 54.45; H, 3.98; N, 4.10. (C₃₁H₂₇IrN₂O₄)Found: C, 54.18; H, 3.96; N, 4.33.

EXAMPLE 43 Synthesis of a Polymerizable Compound[6-(4-vinylphenyl)-2,4-hexanedionato]bis(2-(2,4-difluorophenyl)pyridine)iridium(III) (Hereinafter Abbreviated as Ir(2,4-F-PPy)₂[1-(St-Me)-acac])

(1) As shown in the Reaction Scheme below,2-(2,4-difluorophenyl)pyridine was synthesized by a conventional method.

That is, under argon stream, 8.69 g (55.0 mmol) of 2-bromopyridine wasdissolved in 200 ml of dry tetrahydrofuran and cooled to −78° C. To thiswas dripped 38.7 ml (61.9 mmol) of a 1.6 M hexane solution ofn-butyllithium over 30 minutes. After completion of the dripping,further a solution of 7.5 g (55.0 mmol) of zinc chloride in 50 ml of drytetrahydrofuran was dripped over 30 minutes. After completion of thedripping, the temperature of the mixture was slowly elevated to 0° C.and 9.65 g (55.0 mmol) of 1-bromo-2,4-difluorobenzene and 2.31 g (2.0mmol) of tetrakis(triphenylphosphine)palladium (0) were added thereto.The mixture was stirred for 6 hours under reflux and then 200 ml ofsaturated saline was added to the reaction mixture, followed byextraction of the reaction mixture with diethyl ether. After drying theextract, concentration and purification by column chromatography (silicagel; chloroform/hexane (1/1: volume ratio)) afforded 6.00 g (31.4 mmol)of 2-(2,4-difluorophenyl)pyridine as colorless transparent oil. Yield:63%. Identification was performed by elementary analysis of ¹H-NMR andelementary analysis of C, H and N.

¹H-NMR (CDCl₃₁ ppm): δ 8.71 (d, 1H, J=4.6 Hz), 8.00 (td, 1H, J=8.9, 6.5Hz), 7.8-7.7 (m, 2H), 7.3-7.2 (overlapped with CHCl₃, 1H), 7.1-6.8 (m,2H).

Elementary analysis Calcd: C, 69.11; H, 3.69; N, 7.33. Found: C, 68.98;H, 3.80; N, 7.31.

(2) As shown in the Reaction Scheme below, the obtained2-(2,4-difluorophenyl)pyridine was allowed to react with sodiumhexachloroiridate n-hydrate by a conventional method to synthesizedi(μ-chloro)tetrakis[2-(2,4-difluorophenyl)pyridine)diiridium (III)(hereinafter abbreviated as [Ir(2,4-F-PPy)₂Cl]₂).

That is, 0.96 g (5.0 mmol) of 2-(2,4-difluorophenyl)pyridine and 1.00 gof sodium hexachloroiridate n-hydrate were dissolved in 40 ml of a 3:1mixed solvent of 2-ethoxyethanol and water (by volume ratio) and argongas was blown therein for 30 minutes and the mixture was stirred for 5hours under reflux. The formed precipitate was collected by filtrationand washed with ethanol and then with a small amount of acetone,followed by drying in vacuum for 5 hours to obtain 0.79 g (0.65 mmol) ofthe objective [Ir(2,4-F-PPy)₂Cl]₂ as yellow powder. Yield: 86%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (CDCl₃, ppm): δ 9.12 (d, 4H, J=5.7 Hz), 8.31 (d, 4H, J=8.6 Hz),7.83 (dd, 4H, J=7.6, 7.6 Hz), 6.82 (dd, 4H, J=7.3, 7.3 Hz), 6.34 (ddd,4H, J=11.6, 10.0, 2.4 Hz), 5.29 (dd, 4H, J=9.5, 2.4 Hz).

Elementary analysis Calcd: C, 43.46; H, 1.99; N, 4.61. Found: C, 43.39;H, 2.03; N, 4.55.

(3) As shown in the Reaction Scheme below, [Ir(2,4-F-PPy)₂Cl]₂ and6-(4-vinylphenyl)-2,4-hexanedione were allowed to react to synthesizeIr(2,4-F-PPy)[1-(St-Me)-acac].

That is, 243 mg (0.20 mmol) of [Ir(2,4-F-PPy)₂Cl]₂, 212 mg (2.00 mmol)of sodium carbonate, and 1.3 mg of 2,6-di-tertbutyl-4-methylphenol, and130 mg (0.60 mmol) of 6-(4-vinylphenyl)-2,4-hexanedione synthesized inthe same manner as in Example 38 were dissolved in 20 ml of DMF underargon stream and stirred at 80° C. for 2 hours and then water was addedto the reaction mixture, followed by extraction with chloroform. Afterdrying the extract, concentration and purification by columnchromatography (silica gel; chloroform), followed by recrystallizationfrom a chloroform/hexane solution afforded 261 mg (0.33 mmol) ofIr(2,4-F-PPy) [1-(St-Me)-acac] as yellow crystal. Yield: 83%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.39 (d, 1H, J=5.7 Hz), 8.3-8.2 (m, 2H), 8.04 (d,1H, J=5.7 Hz), 7.8-7.7 (m, 2H), 7.19 (d, 2H, J=7.8 Hz), 7.15 (dd, 1H,J=6.6, 6.6 Hz), 6.97 (dd, 1H, J=6.6, 6.6 Hz), 6.89 (d, 2H, J=7.8 Hz),6.67 (dd, 1H, J=17.6, 10.8 Hz), 6.4-6.2 (m, 2H), 5.7-5.6 (m, 3H), 5.22(s, 1H), 5.21 (d, 1H, J=11.1 Hz), 2.62 (t, 2H, J=7.0 Hz), 2.39 (m, 2H),1.78 (s, 3H).

Elementary analysis Calcd: C, 54.88; H, 3.45; N, 3.56. Found: C, 54.82;H, 3.50; N, 3.49.

EXAMPLE 44 Synthesis of a Polymerizable Compound{3-[4-(2-methacryloyloxyethyl)carbamoyloxyphenylmethyl]-2,4-pentane-dionato}bis(2-phenylpyridine)iridium(III) (Hereinafter Abbreviated as Ir(PPy)₂[3-(MOI-Ph-Me)acac])

(1) As shown in the Reaction Scheme below,di(1-chloro)tetrakis(2-phenylpyridine) diiridium (III) ([Ir(PPy)₂Cl]₂)and 3-(4-hydroxyphenylmethyl)-2,4-pentanedione synthesized byconventional methods were allowed to react to synthesize[3-(4-hydroxyphenylmethyl)-2,4-pentanedionato]bis(2-phenylpyridine)iridium(III) (hereinafter abbreviated as Ir(PPy)₂[3-(OH-Ph-Me)-acac]).

That is, 56 mg (0.052 mmol) of [Ir(PPy)₂Cl]₂ and 44 mg (0.42 mmol) ofsodium carbonate were dissolved in 5 ml of DMF. To this solution wasadded a solution of 30 mg (0.15 mmol) of3-(4-hydroxyphenylmethyl)-2,4-pentanedione synthesized by the knownmethod (C. Cativiela, et al., J. Org. Chem., 60, 3074 (1995)) in 5 ml ofDMF and the mixture was heated at 80° C. for 1.5 hours with stirring.Then to the reaction mixture cooled to room temperature were addeddilute hydrochloric acid and chloroform and the mixture was well shaken.The organic layer was separated and the solvent was distilled off byusing a rotary evaporator and the residue was passed through a silicagel column with a mixed solvent of hexane/ethyl acetate of 1:1 (byvolume ratio) as an eluent to separate a band of a main product.Distilling off the solvent from the obtained pale yellow solution andrecrystallization of the residue from a mixed solution ofdichloromethane/hexane afforded 34 mg (0.048 mmol) ofIr(PPy)₂[3-(OH-Ph-Me)-acac] as pale yellow solid. Yield: 46%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.58 (d, J=5.9 Hz, 2H, PPy), 7.84 (d, J=7.8 Hz,2H, PPy), 7.73 (t, J=6.5 Hz, 2H, PPy), 7.55 (d, J=7.6 Hz, 2H, PPy),7.1-6.6 (m, 10H, aromatic), 6.27 (d, J=7.6 Hz, 2H, PPy), 4.86 (br-s, 1H,OH), 3.62 (s, 2H, benzyl), 1.80 (s, 6H, methyl).

Elementary analysis Calcd: C, 57.86; H, 4.14; N, 3.97. (C₃₄H₂₉IrN₂O₃)Found: C, 57.97; H, 4.22; N, 4.15.

(2) As shown in the Reaction Scheme below, the obtainedIr(PPy)₂[3-(OH-Ph-Me)-acac] and 2-methacryloyloxyethyl isocyanate (Tradename “Karenz MOI”, manufactured by Showa Denko K. K., hereinaftersometimes referred to as “MOI”) were allowed to react to synthesizeIr(PPy)₂[3-(MOI-Ph-Me)-acac].

That is, a solution of 71 mg (0.10 mmol) of Ir(PPy)₂[3-(OH-Ph-Me)-acac],3 mg (0.014 mmol) of 2,6-di-tert-butyl-4-methylphenol, 27 mg (0.12 mmol)of dibutyltin (IV) dilaurate and 55 mg (0.35 mmol) of MOI in 10 ml ofTHF was heated at 70° C. for 2 hours with stirring. The obtainedreaction mixture was concentrated to dryness under reduced pressure byusing a rotary evaporator and the residue was passed through a silicagel column with a mixed solvent of hexane/ethyl acetate of 1:1 (byvolume ratio) as an eluent. The pale yellow solution eluted next to theinitially eluted pale yellow byproduct was recovered and concentrated todryness under reduced pressure. The obtained solid was dissolved in asmall amount of dichloromethane and hexane was added thereto to formprecipitate, which was collected by filtration and dried under reducedpressure to obtain 59 mg (0.069 mmol) of the objectiveIr(PPy)₂[3-(MOI-Ph-Me)-acac] as pale yellow solid. Yield: 68%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.58 (d, J=5.9 Hz, 2H, PPy), 7.88 (d, J=7.8 Hz,2H, PPy), 7.76 (t, J=6.5 Hz, 2H, PPy), 7.57 (d, J=7.6 Hz, 2H, PPy),7.2-6.6 (m, 10H, aromatic), 6.27 (d, J=7.6 Hz, 2H, PPy), 6.16 (s, 1H,olefinic), 5.63 (s, 1H, olefinic), 5.31 (br-s, 1H, NH), 4.31 (m, 2H,ethylene), 3.69 (s, 2H, benzyl), 3.59 (m, 2H, ethylene), 1.98 (s, 3H,methacryl-methyl), 1.80 (s, 6H, diketonate-methyl).

Elementary analysis Calcd: C, 57.20; H, 4.45; N, 4.88. (C₄₁H₃₈IrN₃O₆)Found: C, 57.36; H, 4.43; N, 4.91.

EXAMPLE 45 Synthesis of a Polymerizable Compoundbis(2-(2,4-difluorophenyl)pyridinato)(3-methacryloyloxypicolinato)Iridium (III) (Hereinafter Abbreviated as Ir(2,4-F-PPy)₂(3-MA-pic)).

(1) As shown in the Reaction Scheme below,bis(2-(2,4-difluorophenyl)pyridinato)(3-hydroxypicolinato) Iridium (III)(hereinafter abbreviated as Ir(2,4-F-PPy)₂(3-OH-pic)) was synthesized.

That is, 10 ml of dry N,N-dimethylformamide (DMF) was added to 121.6 mg(0.1 mmol) of [Ir(2,4-F-PPy)₂Cl]₂) prepared in the same manner as inExample 43(1) and (2), 41.7 mg (0.3 mmol) of 3-hydroxypicolinic acid,and 106.0 mg (1.0 mmol) of sodium carbonate under argon stream and themixture was stirred at 80° C. for 2 hours. After adding 50 ml of water,the reaction mixture was extracted with ethyl acetate. After drying theobtained solution over magnesium sulfate, it was concentrated andpurified by column chromatography (silica gel, methanol:chloroform=3:97(by volume ratio)). Recrystallization from hexane/chloroform afforded101.0 mg of Ir(2,4-F-PPy)₂(3-OH-pic) as yellow crystal. Yield: 71%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (DMSO-d₆, ppm): δ 13.6 (br, 1H), 8.50 (d, 1H, J=5.9 Hz), 8.25 (d,2H, J=11.1 Hz), 8.1-8.0 (m, 2H), 7.69 (d, 1H, J=5.7 Hz), 7.62 (d, 1H,J=8.1 Hz), 7.53 (d, 1H, J=4.6 Hz), 7.50 (d, 1H, J=5.7 Hz), 7.36 (t, 1H,J=4.5 Hz), 7.24 (d, 1H, J=5.1 Hz), 6.9-6.7 (m, 2H), 5.66 (dd, 1H, J=8.6,2.4 Hz), 5.48 (dd, 1H, J=8.6, 2.4 Hz).

Elementary analysis Calcd: C, 47.32; H, 2.27; N, 5.91. Found: C, 47.29;H, 2.33; N, 5.86.

(2) As shown in the Reaction Scheme below, Ir(2,4-F—PPy)₂(3-MA-pic) wassynthesized.

That is, 71.1 mg (0.10 mmol) of Ir(2,4-F—PPy)₂(3-OH-pic) and 0.2 mg of2,6-di-t-butyl-4-methylphenol were dissolved in 10 ml of drydichloromethane under argon stream and 101.2 mg (1.0 mmol) oftriethylamine, and 52.3 mg (0.50 mmol) of methacryloyl chloride wereadded to the solution, followed by stirring the mixture at roomtemperature for 2 hours. To the reaction mixture was added 50 ml ofwater and then the reaction mixture was extracted with chloroform. Afterdrying the obtained solution over magnesium sulfate, it was concentratedand purified by column chromatography (silica gel,methanol:chloroform=1:24 (by volume ratio)). Recrystallization of thepurified product from hexane/chloroform afforded 63.1 mg ofIr(2,4-F-PPy)₂(3-MA-pic) as yellow crystal. Yield: 81%. Identificationwas performed by ¹H-NMR and elementary analysis of C, H and N.

¹H-NMR (DMSO-d₆, ppm): δ 8.51 (d, 1H, J=5.4 Hz), 8.3-8.2 (m, 2H),8.1-7.9 (m, 3H), 7.8-7.6 (m, 3H), 7.52 (dd, 1H, J=6.6, 6.6 Hz), 7.35(dd, 1H, J=6.6, 6.6 Hz), 6.9-6.7 (m, 2H), 6.26 (s, 1H), 5.88 (s, 1H),5.68 (dd, 1H, J=8.4, 2.4 Hz), 5.44 (dd, 1H, J=8.4, 2.4 Hz), 2.00 (s,3H).

Elementary analysis Calcd: C, 49.36; H, 2.59; N, 5.40. Found: C, 49.33;H, 2.60; N, 5.41.

EXAMPLE 46 Synthesis of a Polymerizable Compoundbis(2-(2,4-difluorophenyl)pyridinato)(5-methacryloyloxymethylpicolinato)Iridium (III) (Hereinafter Abbreviated as Ir(2,4-F-PPy)₂ (5-CH₂MA-pic)).

(1) As shown in the Reaction Scheme below,bis(2-(2,4-difluorophenyl)pyridinato)(5-(hydroxymethyl)picolinato)Iridium (III) (hereinafter abbreviated as Ir(2,4-F-PPy)₂(5-CH₂OH-pic))was synthesized.

That is, 10 ml of dry N,N-dimethylformamide (DMF) was added to 121.6 mg(0.1 mmol) of [Ir(2,4-F-PPy)₂Cl]₂), 45.9 mg (0.3 mmol) of5-hydroxymethylpicolinic acid, and 106.0 mg (1.0 mmol) of sodiumcarbonate under argon stream and the mixture was stirred at 80° C. for 2hours. After adding 50 ml of water, the reaction mixture was extractedwith ethyl acetate. After drying the obtained solution over magnesiumsulfate, it was concentrated and purified by column chromatography(silica gel, methanol chloroform=1:19 (by volume ratio)).Recrystallization from hexane/chloroform afforded 108.7 mg ofIr(2,4-F-PPy)₂(5-CH₂OH-pic) as yellow crystal. Yield: 75%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (DMSO-d₆, ppm): δ 8.54 (d, 1H, J=4.6 Hz), 8.3-8.2 (m, 2H),8.1-8.0 (m, 4H), 7.70 (s, 1H), 7.61 (d, 1H, J=4.9 Hz), 7.49 (dd, 1H,J=6.6 Hz, 6.6 Hz), 7.32 (dd, 1H, J=6.6 Hz, 6.6 Hz), 6.9-6.7 (m, 2H),5.71 (dd, 1H, J=8.9 Hz, 2.4 Hz), 5.46 (dd, 1H, J=8.5 Hz, 2.3 Hz), 5.42(t, 1H, J=4.6 Hz), 4.49 (d, 2H, J=4.6 Hz).

Elementary analysis Calcd: C, 48.06; H, 2.50; N, 5.80. Found: C, 48.05;H, 2.54; N, 5.86.

(2) As shown in the Reaction Scheme below, Ir(2,4-F-PPy)₂(5-CH₂MA-pic)was synthesized.

That is, 72.5 mg (0.1 mmol) of Ir(2,4-F-PPy)₂(5-CH₂OH-pic) and 0.2 mg of2,6-di-t-butyl-4-methylphenol were dissolved in 10 ml of drydichloromethane under argon stream and 101.2 mg (1.0 mmol) oftriethylamine, and 52.3 mg (0.5 mmol) of methacryloyl chloride wereadded to the solution, followed by stirring, the mixture at roomtemperature for 2 hours. To the reaction mixture was added 50 ml ofwater and then the reaction mixture was extracted with chloroform. Afterdrying the obtained solution over magnesium sulfate, it was concentratedand purified by column chromatography (silica gel,methanol:chloroform=3:97 (by volume ratio)). Recrystallization of thepurified product from hexane/chloroform afforded 70.6 mg ofIr(2,4-F-PPy)₂(5-CH₂MA-pic) as yellow crystal. Yield: 89%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (DMSO-d₆, ppm): δ 8.53 (d, 1H, J=5.1 Hz), 8.28 (d, 1H, J=8.4 Hz),8.22 (d, 1H, J=8.6 Hz), 8.1-8.0 (m, 4H), 7.70 (s, 1H), 7.66 (d, 1H,J=4.9 Hz), 7.48 (dd, 1H, J=6.5 Hz, 6.5 Hz), 7.31 (dd, 1H, J=6.5 Hz, 6.5Hz), 6.9-6.7 (m, 2H), 5.84 (s, 1H), 5.7-5.6 (m, 2H), 5.47 (dd, 1H, J=8.8Hz, 2.6 Hz), 5.24 (d, 2H, J=2.7 Hz), 1.78 (s, 3H).

Elementary analysis Calcd: C, 50.00; H, 2.80; N, 5.30. Found: C, 49.92;H, 2.87; N, 5.28.

EXAMPLE 47 Synthesis of a Polymerizable Compoundbis(2-(2,4-difluorophenyl)pyridinato)(5-(2-(methacryloyloxy)ethyl-carbamoyloxymethyl)picolinato)Iridium (III) (Hereinafter Abbreviated as Ir(2,4-F-PPy)₂(5-CH₂MOI-pic)).

As shown in the Reaction Scheme below, Ir(2,4-F-PPy)₂(5-CH₂MOI-pic) wassynthesized.

That is, 72.5 mg (0.1 mmol) of Ir(2,4-F-PPy)₂(5-CH₂OH-pic) as theintermediate in Example 46, 0.2 mg of 2,6-di-t-butyl-4-methylphenol(BHT) and 1.3 mg of dibutyltin (IV) dilaurate (DBTL) were dissolved in10 ml of dry tetrahydrofuran. To this was added 31.0 mg (0.2 mmol) of2-methacryloyloxyethyl isocyanate (Trade name “Karenz MOI”, manufacturedby Showa Denko K.K., hereinafter sometimes referred to as “MOI”) and themixture was stirred at 50° C. for 1 hour. To the reaction mixture wasadded 50 ml of water and then the reaction mixture was extracted withchloroform. After drying the obtained solution over magnesium sulfate,it was concentrated and purified by column chromatography (silica gel,methanol:chloroform=3:97 (by volume ratio)). Recrystallization of thepurified product from hexane/chloroform afforded 76.4 mg ofIr(2,4-F-PPy)₂(5-CH₂MOI-pic) as yellow crystal. Yield: 87%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (DMSO-d₆, ppm): δ 8.53 (d, 1H, J=5.1 Hz), 8.32 (dd, 2H, J=8.0,1.8 Hz), 8.25 (d, 1H, J=8.9 Hz), 8.22 (d, 1H, J=9.2 Hz), 8.1-8.0 (m,3H), 7.60 (d, 1H, J=4.6 Hz), 7.51 (dd, 1H, J=6.5, 6.5 Hz), 7.35 (dd, 1H,J=6.5, 6.5 Hz), 6.9-6.7 (m, 2H), 6.10 (s, 1H), 5.87 (s, 1H), 5.71 (dd,1H, J=8.4, 2.2 Hz), 5.46 (dd, 1H, J=8.8, 2.6 Hz), 4.90 (s, 2H), 4.23 (t,2H, J=1.9 Hz), 3.47 (m, 2H), 1.90 (s, 3H).

Elementary analysis Calcd: C, 50.62; H, 3.33; N, 6.38. Found: C, 50.59;H, 3.35; N, 6.32.

EXAMPLE 48 Synthesis of a Polymerizable Compoundbis(2-(2,4-difluorophenyl)pyridinato)(5-(2-(methacryloyloxy)ethoxycarbonyl)picolinato) Iridium (III)(Hereinafter Abbreviated as Ir (2,4-F-PPy)₂(5-COHEMA-pic)).

(1) As shown in the Reaction Scheme below,bis(2-(2,4-difluorophenyl)pyridinato) (5-carboxypicolinato) Iridium(III) (hereinafter abbreviated as Ir(2,4-F-PPy)₂(5-COOH-pic)) wassynthesized.

That is, 10 ml of dry N,N-dimethylformamide was added to 243.2 mg (0.2mmol) of Ir[(2,4-F-PPy)₂Cl]₂, 100.3 mg (0.6 mmol) of2,5-pyridinedicarboxylic acid, and 212.0 mg (2.0 mmol) of sodiumcarbonate and the mixture was stirred at 80° C. for 2 hours. To thereaction mixture was added 50 ml of 1 N hydrochloric acid to precipitatethe product, which was filtered. This was dissolved in a small amount ofchloroform and purified using column chromatography (silica gel,methanol:chloroform=1:4). Further, reprecipitation of the purifiedproduct from hexane/ethanol afforded 204.0 mg ofIr(2,4-F-PPy)₂(5-COOH-pic) as yellow crystal. Yield: 69%. Identificationwas performed by ¹H-NMR and elementary analysis of C, H and N.

¹H-NMR (DMSO-d₆, ppm): δ 10.7 (s, 1H), 8.53 (d, 1H, J=5.1 Hz), 8.37 (dd,2H, J=8.0, 1.8 Hz), 8.28 (d, 1H, J=8.9 Hz), 8.25 (d, 1H, J=9.2 Hz),8.1-8.0 (m, 3H), 7.59 (d, 1H, J=4.6 Hz), 7.47 (dd, 1H, J=6.5, 6.5 Hz),7.32 (dd, 1H, J=6.5, 6.5 Hz), 6.9-6.7 (m, 2H), 5.70 (dd, 1H, J=8.4, 2.2Hz), 5.48 (dd, 1H, J=8.8, 2.6 Hz).

Elementary analysis Calcd: C, 47.15; H, 2.18; N, 5.69. Found: C, 47.10;H, 2.28; N, 5.66.

(2) As shown in the Reaction Scheme below, Ir(2,4-F-PPy)₂(5-COHEMA-pic)was synthesized.

That is, 73.9 mg (0.1 mmol) of Ir(2,4-F-PPy)₂(5-COOH-pic), 52.5 mg (0.2mmol) of triphenylphoshine (PPh₃), 19.5 mg (0.15 mmol) of 2-hydroxyethylmethacrylate were dissolved in 10 ml of dry THF under argon stream and65.3 mg (0.15 mmol) of a 40% toluene solution of diethylazodicarboxylate (DEAD) was dripped thereto at −20° C. The mixture wasleft to stand as it was while the temperature was elevated to roomtemperature and the mixture was stirred for 2 hours. After completion ofthe reaction, the solvent was distilled off and the reaction mixture wasconcentrated to dryness. Then the residue was dissolved in a smallamount of chloroform and purified using column chromatography (silicagel, methanol chloroform=1:19 (by volume ratio)). Recrystallization ofthe purified product from hexane/chloroform afforded 61.5 mg ofIr(2,4-F-PPy)₂(5-COHEMA-pic) as yellow crystal. Yield: 72%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (DMSO-d₆, ppm): δ 8.54 (d, 1H, J=5.1 Hz), 8.37 (dd, 2H, J=8.0,1.8 Hz), 8.31 (d, 1H, J=8.9 Hz), 8.27 (d, 1H, J=9.2 Hz), 8.1-8.0 (m,3H), 7.57 (d, 1H, J=4.6 Hz), 7.46 (dd, 1H, J=6.5, 6.5 Hz), 7.32 (dd, 1H,J=6.5, 6.5 Hz), 6.9-6.7 (m, 2H), 6.10 (s, 1H), 5.87 (s, 1H), 5.71 (dd,1H, J=8.4, 2.2 Hz), 5.51 (dd, 1H, J=8.8, 2.6 Hz), 4.64 (t, 2H, J=2.0Hz), 4.55 (t, 2H, J=2.0 Hz), 1.93 (s, 3H).

Elementary analysis Calcd: C, 49.41; H, 2.84; N, 4.94. Found: C, 49.38;H, 2.88; N, 4.95.

EXAMPLE 49 Synthesis of a Polymerizable Compoundbis(2-(2,4-difluorophenyl)pyridinato)(3-(4-(vinylphenyl)methoxy-picolinato) Iridium (III) (HereinafterAbbreviated as Ir(2,4-F-PPy)₂(3-ST-pic)).

As shown in the Reaction Scheme below, Ir(2,4-F-PPy)₂(3-ST-pic) wassynthesized.

That is, 5 ml of dry N,N-dimethylformamide was added to 35.5 mg (0.05mmol) of Ir(2,4-F-PPy)₂(3-OH-pic) as the intermediate in Example 45,69.1 mg (0.5 mmol) of potassium carbonate, and 0.1 mg of2,6-di-t-butyl-4-methylphenol under argon stream and 30.5 mg (0.2 mmol)of 4-vinylbenzyl chloride was further added thereto. The mixture wasstirred at 80° C. for 4 hours. To the reaction mixture was added 50 mlof water to precipitate the product, which was collected by filtrationand purified by column chromatography (silica gel,methanol:chloroform=3:97 (by volume ratio)). Recrystallization of thepurified product from hexane/chloroform afforded 24.0 mg ofIr(2,4-F-PPy)₂(3-ST-pic) as yellow crystal. Yield: 58%. Identificationwas performed by ¹H-NMR and elementary analysis of C, H and N.

¹H-NMR (DMSO-d₆, ppm): δ 8.59 (d, 1H, J=5.1 Hz), 8.3-8.2 (m, 2H),8.1-8.0 (m, 2H), 7.9 (d, 1H, J=8.6 Hz), 7.67 (d, 1H, J=5.1 Hz), 7.6-7.3(m, 7H), 6.9-6.7 (m, 3H), 5.85 (d, 1H, J=17.8 Hz), 5.67 (dd, 1H, J=8.9,2.4 Hz), 5.45 (dd, 1H, J=8.9, 2.4 Hz), 5.29 (s, 2H), 5.27 (d, 1H, J=11.1Hz).

Elementary analysis Calcd: C, 53.75; H, 2.93; N, 5.08. Found: C, 53.71;H, 2.90; N, 5.03.

EXAMPLE 50 Synthesis of a Polymerizable Compound bis(2-phenylpyridinato)(3-methacryloyloxypicolinato) Iridium (III) (Hereinafter Abbreviated asIr(PPy)₂(3-MA-pic))

(1) As shown in the Reaction Scheme below, bis(2-phenylpyridinato)(3-hydroxypicolinato) Iridium (III) (hereinafter abbreviated asIr(PPy)₂(3-OH-pic)) was synthesized.

That is, 10 ml of dry N,N-dimethylformamide (DMF) was added to 107.2 mg(0.1 mmol) of di(μ-chloro)tetrakis(2-phenylpyridine) diiridium (III)(hereinafter abbreviated as [Ir(PPy)₂Cl]₂) synthesized by a conventionalmethod, 41.7 mg (0.3 mmol) of 3-hydroxypicolinic acid, and 106.0 mg (1.0mmol) of sodium carbonate under argon stream and the mixture was stirredat 80° C. for 2 hours. After adding 50 ml of water, the reaction mixturewas extracted with chloroform. After drying the obtained solution overmagnesium sulfate, it was concentrated and purified by columnchromatography (silica gel, methanol:chloroform=1:19 (by volume ratio)).Recrystallization from hexane/chloroform afforded 106.0 mg ofIr(PPy)₂(3-OH-pic) as yellow crystal. Yield: 83%. Identification wasperformed by ¹H-NMR and elementary analysis of C, H and N.

¹H-NMR (DMSO-d₆, ppm): δ 8.46 (d, 1H, J=4.9 Hz), 8.23 (d, 1H, J=8.1 Hz),8.20 (d, 1H, J=8.6 Hz), 8.0-7.9 (m, 2H), 7.80 (m, 2H), 7.60 (dd, 1H,J=5.9, 5.9 Hz), 7.55 (d, 1H, J=1.4 Hz), 7.47 (dd, 1H, J=8.5, 5.0 Hz),7.40 (dd, 1H, J=5.9, 5.9 Hz), 7.26 (dd, 1H, J=5.9, 5.9 Hz), 7.16 (dd,1H, J=4.9, 1.4 Hz), 6.90 (dd, 1H, J=7.6, 7.6 Hz), 6.87 (dd, 1H, J=7.6,7.6 Hz), 6.8-6.7 (m, 2H), 6.20 (d, 1H, J=7.6 Hz), 6.05 (d, 1H, J=7.6Hz).

Elementary analysis Calcd: C, 52.65; H, 3.16; N, 6.58. Found: C, 52.62;H, 3.21; N, 6.57.

(2) As shown in the Reaction Scheme below, Ir(PPy)₂(3-MA-pic) wassynthesized.

That is, 31.9 mg (0.05 mmol) of Ir(PPy)₂(3-OH-pic) and 0.1 mg of2,6-di-t-butyl-4-methylphenol were dissolved in 5 ml of drydichloromethane under argon stream and 50.6 mg (0.5 mmol) oftriethylamine, and 26.1 mg (0.25 mmol) of methacryloyl chloride wereadded to the solution, followed by stirring the mixture at roomtemperature for 2 hours. To the reaction mixture was added 50 ml ofwater and then the reaction mixture was extracted with chloroform. Afterdrying the obtained solution over magnesium sulfate, it was concentratedand purified by column chromatography (silica gel,methanol:chloroform=1:19 (by volume ratio)). Recrystallization of thepurified product from hexane/chloroform afforded 23.0 mg ofIr(PPy)₂(3-MA-pic) as yellow crystal. Yield: 65%. Identification wasperformed by ¹H-NMR and elementary analysis of C, H and N.

¹H-NMR (DMSO-d₆, ppm): δ 8.50 (d, 1H, J=5.7 Hz), 8.23 (d, 1H, J=4.9 Hz),8.21 (d, 1H, J=5.7 Hz), 8.0-7.9 (m, 3H), 7.81 (t, 2H, J=8.9 Hz), 7.7-7.5(m, 3H), 7.42 (dd, 1H, J=6.6, 6.6 Hz), 7.25 (dd, 1H, J=6.3, 6.3 Hz),6.91 (dd, 1H, J=7.6, 7.6 Hz), 6.86 (dd, 1H, J=7.6, 7.6 Hz), 6.25 (s,1H), 6.22 (d, 1H, J=7.8 Hz), 6.01 (d, 1H, J=7.3 Hz), 5.87 (s, 1H), 2.01(s, 3H).

Elementary analysis Calcd: C, 54.38; H, 3.42; N, 5.95. Found: C, 54.29;H, 3.51; N, 5.94.

EXAMPLE 51 Synthesis of N-vinylcarbazole/Ir(2,4-F-PPy)₂(3-MA-pic)Copolymer (Hereinafter, Abbreviated as VCz-co-Ir(2,4-F-PPy)₂ (3-MA-pic))

The titled copolymer was synthesized as a light emitting materialcontaining Ir(2,4-f-PPy)₂(3-MA-pic) as a unit having the function ofluminescence and N-vinylcarbazole as a unit having the function of holetransportation.

966 mg (5.0 mmol) of N-vinylcarbazole, 38.9 mg (0.05 mmol) ofIr(2,4-f-PPy)₂(3-MA-pic), and 8.2 mg (0.05 mmol) of AIBN were dissolvedin 25 ml of dry toluene and argon was blown into the obtained solutionfor 1 hour. This solution was warmed up to 80° C. to initiatepolymerization reaction and the reaction mixture was stirred as it wasfor 8 hours. After cooling, the reaction mixture was dripped into 250 mlof methanol to precipitate a polymer, which was recovered by filtration.Further, the recovered polymer was dissolved in 25 mol of chloroform.This solution was purified by dripping it into 250 ml of methanol toreprecipitate the polymer and dried in vacuum at 60° C. for 12 hours toobtain 673 mg of the objective compound VCz-co-Ir(2,4-F-PPy)₂(3-MA-pic).Table 5 shows yields, results of GPC measurements, and Ir complexcontents measured by ICP elementary analyses.

EXAMPLES 52 TO 56

Copolymers were synthesized in the same manner as in Example 51 exceptthat the polymerizable compounds prepared in Examples 46 to 50,respectively, were used in place of Ir(2,4-F-PPy)₂(3-MA-pic). Table 5shows yields, results of GPC measurements, and Ir complex contentsmeasured by ICP elementary analyses.

TABLE 5 Ir Complex Recovery GPC Measurement Content Example Polymer (%)Mn Mw Mw/Mn (mol %) 51 VCz-co-Ir(2,4-F-PPy)₂(3-MA-pic) 67 4500 128002.84 1.07 52 VCz-co-Ir(2,4-F-PPy)₂(5-CH₂MA-pic) 79 4300 13600 3.16 1.0453 VCz-co-Ir(2,4-F-PPy)₂(5-CH₂MOI-pic) 63 5100 14800 2.90 1.02 54VCz-co-Ir(2,4-F-PPy)₂(5-COHEMA-pic) 61 4100 13700 3.34 0.98 55VCz-co-Ir(2,4-F-PPy)₂(3-ST-pic) 72 4600 11400 2.48 1.04 56VCz-co-Ir(PPy)₂(3-MA-pic) 74 4400 13000 2.95 1.01 Mn: Number averagemolecular weight Mw: Weight average molecular weight

EXAMPLES 57 TO 62 Fabrication and Evaluation of Organic Light EmittingDevices

Organic light emitting devices were fabricated by using ITO-substrate(manufactured by Nippo Electric Co., Ltd.) which is 25 mm×25 mm glasssubstrates provided on one side thereof with two ITO (indium tin oxide)electrodes serving as anodes, each being 4 mm in width formed in theform of stripes.

First, poly(3,4-ethylenedioxythiophene)/polystyrenesulfonic acid(manufactured by Bayer AG, trade name “Baytron P”) was coated on the ITO(anode) of the above-mentioned ITO-substrate by a spin coating methodunder the conditions of 3,500 rpm and a coating time of 40 seconds anddried in a vacuum drier at 60° C. for 2 hours to form an anode bufferlayer. The obtained anode buffer layer had a film thickness of about 50nm.

Then, a coating solution for forming a layer containing a light emittingmaterial and an electron transporting material was prepared. 21.0 mg ofthe light emitting material shown in Table 6 and 9.0 mg of2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD)(manufactured by Tokyo Kasei Kogyo Co., Ltd.) as an electrontransporting material were dissolved in 2970 mg of chloroform(manufactured by Wako Pure Chemical Industries, Ltd., reagent grade) andthe obtained solution was filtered through a filter having a pore sizeof 0.2 μm to prepare a coating solution.

Further, the obtained coating solution was coated on the anode bufferlayer by a spin coating method under the conditions of 3,000 rpm and acoating time of 30 seconds and dried at room temperature (25° C.) for 30minutes to form a layer containing a light emitting material and anelectron transporting material. The obtained layer had a film thicknessof about 100 nm.

Then, the substrate having formed thereon a layer containing a lightemitting material and an electron transporting material was placed in avapor deposition apparatus and silver and magnesium were codeposited ina weight ratio of 1:10 to form two cathodes in the form of stripes of 3mm in width so as to cross the direction of length of the anodes atright angles. The obtained cathodes had a film thickness of about 50 nm.

Finally, in an argon atmosphere, lead wires (wiring) were attached tothe anodes and cathodes to fabricate four organic light emitting devicesof 4 mm (length)×3 mm (width). Voltage was applied to theabove-mentioned organic EL devices by using a programmable directvoltage/current source TR6143 manufactured by Advantest Corporation tocause luminescence and the luminance was measured by using a luminancemeter BM-8 manufactured by Topcon Corporation. As a result, theluminescence starting voltage and initial luminance at 20 V as shown inTable 6 were obtained (average of four devices for each light emittingmaterial).

TABLE 6 Luminescence 20 V Starting Initial Light Emitting Materialvoltage Luminance Example Polymer Example (V) (cd/m²) 57VCz-co-Ir(2,4-F-PPy)₂(3-MA-pic) 54 8 790 58VCz-co-Ir(2,4-F-PPy)₂(5-CH₂MA-pic) 55 8 500 59VCz-co-Ir(2,4-F-PPy)₂(5-CH₂MOI-pic) 56 9 640 60VCz-co-Ir(2,4-F-PPy)₂(5-COHEMA-pic) 57 8 740 61VCz-co-Ir(2,4-F-PPy)₂(3-ST-pic) 58 9 800 62 VCz-co-Ir(PPy)₂(3-MA-pic) 598 910

EXAMPLE 63 Synthesis of a Polymerizable Compound[6-(4-vinylphenyl)-2,4-hexanedionato] bis[2-(2-pyridyl)benzothienyl)iridium (III) (Hereinafter Abbreviated as Ir(btp)₂[1-(StMe)-acac])

As shown in the Reaction Scheme below,6-(4-vinylbiphenyl)-2,4-hexanedione prepared in the same manner as inExample 38(1) and di(μ-chloro)tetrakis(2-(2-pyridyl)benzothienyl)diiridium (III) (hereinafter abbreviated as [Ir(btp)₂Cl]₂) synthesizedby a conventional method (cf., e.g., S. Lamansky, et al., InorganicChemistry, 40, 1704 (2001)) were allowed to react to synthesizeIr(btp)₂[1-(StMe)-acac)].

That is, to a suspension of 253 mg (0.20 mmol) of [Ir(btp)₂Cl]₂ in 10 mlof N,N-dimethylformamide (hereinafter abbreviated as DMF) were added 161mg (0.74 mmol) of 6-(4-vinylphenyl)-2,4-hexanedione, 64 mg of sodiumcarbonate and 1.9 mg (0.0086 mmol) of 2,6-di-tert-butyl-4-methylphenol(hereinafter abbreviated as BHT), and the mixture was heated at 80° C.for 1 hour with stirring. To the reaction mixture were added 100 ml ofwater and 50 ml of chloroform and the obtained mixture was well shaken.The organic layer was dried over magnesium sulfate and then concentratedto dryness under reduced pressure by using a rotary evaporator. Then,the crude product was purified through a silica gel column withdichloromethane as an eluent to obtain a reddish brown solution. Thesolution was concentrated under reduced pressure and hexane was addedthereto followed by recrystallization at −20° C. to obtain 153 mg (0.18mg) of the objective Ir(btp)₂[1-(StMe)-acac] as reddish brown solid.Yield: 47%. Identification was performed by elementary analysis of C, Hand N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.40 (d, J=5.4 Hz, 1H, btp), 7.97 (d, J=5.4 Hz,1H, btp), 7.65 (m, 6H, btp), 7.1-6.7 (m, 10H, aromatic), 6.63 (dd,J=17.8, 11.1 Hz, 1H, vinylic), 6.24 (d, J=8.1 Hz, 1H, btp), 6.16 (d,J=7.8 Hz, 1H, btp), 5.65 (d, J=17.8 Hz, 1H, vinylic), 5.22 (s, 1H,diketonate-methine), 5.18 (d, J=11.1 Hz, 1H, vinylic), 2.56 (m, 2H,ethylene), 2.37 (m, 2H, ethylene), 1.75 (s, 3H, methyl).

Elementary analysis Calcd: C, 58.02; H, 3.77; N, 3.38. (C₄₀H₃₁IrN₂O₂S₂)Found: C, 57.79; H, 3.81; N, 3.55.

EXAMPLE 64 Synthesis of a Polymerizable Compound[6-(4-methacryloyloxyphenyl)-2,4-hexanedionato]bis[2-(2-pyridyl)benzothienyl] iridium (III) (hereinafter abbreviated asIr(btp)₂[1-(MA-Ph-Me)-acac])

(1) As shown in the Reaction Scheme below,6-(4-hydroxyphenyl)-2,4-hexanedione prepared in the same manner as inExample 41(1) and (2) and [Ir(btp)₂Cl]₂ synthesized by a conventionalmethod were allowed to react to synthesize Ir(btp)₂[1-(OH-Ph-Me)-acac)].

That is, 245 mg (0.19 mmol) of [Ir(btp)₂Cl]₂ and 111 mg (1.06 mmol) ofsodium carbonate were dissolved in a solution of 141 mg (0.680 mmol) of6-(4-hydroxyphenyl)-2,4-hexanedione in 10 ml of DMF and the mixture washeated at 80° C. for 1.5 hours with stirring. To the reaction mixturecooled to room temperature were added chloroform and an aqueous solutionof ammonium chloride, and the obtained mixture was well shaken. Theorganic layer was dried over magnesium sulfate and then the solvent wasdistilled off by using a rotary evaporator. The residue was passedthrough a silica gel column (eluent:hexane/dichloromethane/acetone=5/10/1 (by volume ratio)) and a bandcontaining a main product having a reddish brown color was separated andconcentrated to dryness under reduced pressure to obtain 215 mg (0.26mmol) of the objective Ir(btp) 2 [1-(OH-Ph-Me)-acac)] as reddish brownsolid. Yield: 70%. Identification was performed by elementary analysisof C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 8.40 (d, J=5.4 Hz, 1H, btp), 8.06 (d, J=5.4 Hz,1H, btp), 7.63 (m, 6H, btp), 7.04 (m, 3H, btp), 6.81 (m, 3H, btp), 6.66(d, J=8.4 Hz, 2H, —C₆H₄—OH), 6.38 (d, J=8.4 Hz, 2H, —C₆H₄—OH), 5.22 (s,1H, diketonate-methine), 5.20 (br, 1H, OH), 2.48 (m, 2H, methylene),2.31 (m, 2H, methylene), 1.75 (s, 3H, methyl).

Elementary analysis Calcd: C, 55.80; H, 3.57; N, 3.42. (C₃H₂₉IrN₂O₃S₂)Found: C, 56.19; H, 3.57; N, 3.31.

(2) As shown in the Reaction Scheme below, the obtainedIr(btp)₂[1-(OH-Ph-Me)-acac] and methacryloyl chloride were allowed toreact to synthesize Ir(btp)₂[1-(MA-Ph-Me)-acac].

That is, to a solution of 248 mg (0.32 mmol) ofIr(btp)₂[1-(OH-Ph-Me)-acac] in 20 ml of dry dichloromethane were added0.25 ml (1.8 mmol) of triethylamine and 0.20 ml (2.0 mmol) ofmethacryloyl chloride, and the mixture was stirred at room temperaturefor 1 hour. Then, the reaction mixture was washed with 20 ml of anaqueous solution of sodium carbonate and the solvent was distilled offunder reduced pressure. The residue was purified by columnchromatography (eluent: a mixed solvent ofhexane/dichloromethane/acetone of 2:4:1 (by volume ratio)) and thereddish brown solution that was first eluted was separated and driedunder reduced pressure to obtain 180 mg (0.20 mmol) of the objectiveIr(btp)₂[1-(MA-Ph-Me)-acac] as reddish brown solid. Yield: 64%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ8.42 (d, J=5.4 Hz, 1H, btp), 8.10 (d, J=5.4 Hz,1H, btp), 7.65 (m, 6H, btp), 7.1-6.7 (m, 10H, aromatic), 6.40 (d, J=8.1Hz, 1H, btp), 6.27 (d, J=8.1 Hz, 1H, btp), 6.12 (s, 1H, olefinic), 5.71(s, 1H, olefinic), 5.19 (s, 1H, diketonate-methine), 2.51 (m, 2H, C₂H₄),2.39 (m, 2H, C₂H₄), 1.89 (s, 3H, methacryl-methyl), 1.80 (s, 3H,diketonate-methyl).

Elementary analysis Calcd: C, 56.93; H, 3.75; N, 3.16. (C₄₂H₃₃IrN₂O₄S₂)Found: C, 57.09; H, 3.77; N, 4.18.

EXAMPLE 65 Synthesis of a Polymerizable Compound{6-[4-(2-methacryloyloxy)ethylcarbamoyloxyphenyl]-2,4-hexanedionato}bis[2-(2-pyridyl)benzothienyl]iridium(III) (hereinafter abbreviated as Ir(btp)₂[1-(MOI-Ph-Me)-acac])

As shown in the Reaction Scheme below, Ir(btp)₂[1-(OH-Ph-Me)-acac]obtained in Example 64 and 2-methacryloyloxyethyl isocyanate (Trade name“Karenz MOI”, manufactured by Showa Denko K. K., hereinafter sometimesreferred to as “MOI”) were allowed to react to synthesizeIr(btp)₂[1-(MOI-Ph-Me)-acac].

That is, to a solution of 215 mg (0.26 mmol) ofIr(btp)₂[1-(OH-Ph-Me)-acac] in 10 ml of THF were added 4.0 mg (0.18mmol) of BHT, 35 mg of dibutyltin (IV) dilaurate (hereinafterabbreviated as DBTL) and 401 mg (2.58 mmol) of MOI, and the mixture washeated for 3 hours under reflux in a hot water bath. Then, the reactionmixture cooled to room temperature was dried under reduced pressure andthe residue was purified through a silica gel column (eluent: a mixedsolvent of hexane/dichloromethane/acetone of 5:10:1 (by volume ratio)).A band containing a main product having a reddish brown color thateluted first was separated and concentrated to dryness under reducedpressure to obtain 223 mg (0.23 mmol) of the objectiveIr(btp)₂[1-(MOI-Ph-Me)-acac)] as reddish brown solid. Yield: 87%.Identification was performed by elementary analysis of C, H and N and¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ8.40 (d, J=5.7 Hz, 1H, btp), 8.12 (d, J=5.1 Hz,1H, btp), 7.65 (m, 6H, btp), 7.1-6.7 (m, 10H, aromatic), 6.25 (d, J=8.4Hz, 1H, btp), 6.20 (d, J=8.1 Hz, 1H, btp), 6.16 (s, 1H, olefinic), 5.63(s, 1H, olefinic), 5.26 (br-s, 1H, NH), 5.21 (s, 1H,diketonate-methine), 4.31 (t, J=5.4 Hz, 2H, N—C₂H₄-o), 3.59 (t, J=5.4Hz, 2H, N—C₂H₄—O), 2.55 (m, 2H, C—C₂H₄—C), 2.34 (m, 2H, C—C₂H₄—C), 1.98(s, 3H, methacryl-methyl), 1.76 (s, 3H, diketonate-methyl).

Elementary analysis Calcd: C, 55.54; H, 3.94; N, 4.32. (C₄₅H₃₈IrN₃O₆S₂)Found: C, 55.13; H, 3.89; N, 4.58.

EXAMPLE 66 Synthesis of a Polymerizable Compound[1-(2-methacryloyloxy)ethylcarbamoyloxy-2,4-pentanedionato]bis[2-(2-pyridyl)benzothienyl] iridium (III) (Hereinafter Abbreviated asIr(btp)₂(1-MOI-acac)

(1) As shown in the Reaction Scheme below, [Ir(btp)₂Cl]₂ synthesized bya conventional method and(1-tert-butyldimethylsilyloxy)-2,4-pentanedione(1-TBDMSO-2,4-pentanedione) synthesized by referencing the known method(EP Patent No. 0514217) were allowed to react to synthesizeIr(btp)₂(1-OH-acac).

That is, 449 mg (0.35 mmol) of [Ir(btp)₂Cl]₂ and 137 mg (1.29 mmol) ofsodium carbonate were dissolved in a solution of 310 mg (1.35 mmol) of1-TBDMSO-2,4-pentanedione in 15 ml of DMF, and the mixture was heated at80° C. for 1 hour with stirring. The obtained reaction mixture wascooled to room temperature and chloroform and dilute hydrochloric acidwere added thereto, and well shaken. Subsequently, the organic layer waswashed with water, and the solvent was distilled off under reducedpressure. The residue was purified by silica gel column chromatography(eluent: dichloromethane) and the compound having a reddish brown colorthat eluted first was separated and concentrated to dryness underreduced pressure. The obtained solid was dissolved in 10 ml of dry THFand 0.60 ml (0.60 mmol) of a 1.0 M THF solution of tetra-n-butylammoniumfluoride (n-Bu₄NF) was dripped thereto while vigorously stirring themixture. The solution was stirred at room temperature for 0.5 hour andthen the solvent was distilled off under reduced pressure. The residuewas purified by silica gel column chromatography (eluent: a mixedsolvent of hexane/dichloromethane/acetone of 5:10:2 (by volume ratio)).Separation of a main product having a reddish brown color and drying itunder reduced pressure afforded 360 mg (0.49 mmol) of the objectiveIr(btp)₂(1-OH-acac) as reddish brown solid. Yield: 71%. Identificationwas performed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.40 (d, J=5.4 Hz, 1H, btp), 8.35 (d, J=5.1 Hz,1H, btp), 7.79 (m, 2H, btp), 7.63 (m, 4H, btp), 7.04 (m, 4H, btp), 6.81(t, J=7.3 Hz, 2H, btp), 6.20 (t, J=6.8 Hz, 2H, btp), 5.24 (s, 1H,diketonate-methine), 3.89 (dd, J=8.1, 5.1 Hz, 1H, —CHH′—OH), 3.80 (dd,J=8.1, 5.1 Hz, 1H, —CHH′—OH), 2.92 (t, J=5.1 Hz, 1H, OH), 1.83 (s, 3H,diketonate-methyl).

Elementary analysis Calcd: C, 51.15; H, 3.18; N, 3.85. (C₃₃H₂₃IrN₂O₃S₃)Found: C, 51.41; H, 3.36; N, 3.49.

(2) As shown in the Reaction Scheme below, Ir(btp)₂(1-OH-acac) wasallowed to react with MOI by addition reaction to synthesizeIr(btp)₂(1-MOI-acac).

That is, 177 mg of Ir(btp)₂(1-OH-acac), 3.0 mg (0.086 mmol) of BHT and20 mg (0.032 mmol) of DBTL were dissolved in 10 ml of THF and 100 mg(0.64 mmol) of MOI was added thereto. The obtained mixture was heatedunder reflux for 2 hours in an oil bath. Then, the reaction mixturecooled to room temperature was dried under reduced pressure and theresidue was purified by silica gel column chromatography (eluent: amixed solvent of hexane/dichloromethane/acetone of 10:20:3 (by volumeratio)). A main product having a reddish brown color that eluted secondwas separated and concentrated to dryness under reduced pressure. Thesolid was dissolved in a mixed solvent of dichloromethane/hexane andrecrystallized therefrom at −20° C. to obtain 173 mg (0.20 mmol) of theobjective Ir(btp) 2 (1-MOI-acac) as reddish brown needle crystal. Yield:81%. Identification was performed by elementary analysis of C, H and Nand ¹H-NMR.

¹H-NMR (CDCl₃₁ ppm): δ 8.49 (d, J=5.7 Hz, 1H, btp), 8.40 (d, J=5.4 Hz,1H, btp), 7.74 (m, 2H, btp), 7.61 (m, 4H, btp), 7.03 (m, 4H, btp), 6.80(m, 2H, btp), 6.21 (m, 2H, btp), 6.06 (s, 1H, olefinic), 5.55 (s, 1H,olefinic), 5.31 (s, 1H, diketonate-methine), 4.92 (br-s, 1H, NH), 4.25(s, 2H, N—C(═O)—O—CH₂—), 3.97 (m, 2H, N—CH₂—CH₂—O), 3.16 (m, 2H,N—CH₂—CH₂—O), 1.91 (s, 3H, CH₃C(═CH₂)—), 1.81 (s, 3H,diketonate-methyl).

Elementary analysis Calcd: C, 51.69; H, 3.65; N, 4.76. (C₃₈H₃₂IrN₃O₆S₂)Found: C, 51.88; H, 3.65; N, 4.51.

EXAMPLE 67 Synthesis of N-vinylcarbazole/Ir(btp)₂[1-(StMe)-acac]Copolymer (Hereinafter, Abbreviated asVCz-co-Ir(btp)_(2[)1-(StMe)-acac])

The titled copolymer was synthesized as a light emitting materialcontaining Ir(btp)₂[1-(StMe)-acac] as a unit having the function ofluminescence and N-vinylcarbazole as a unit having the function of holetransportation.

1.55 g (8.0 mmol) of N-vinylcarbazole, 33 mg (0.04 mmol) ofIr(btp)₂[1-(StMe)-acac], and 13 mg (0.08 mmol) of AIBN were dissolved in40 ml of dry toluene and argon was blown into the obtained solution for1 hour. This solution was warmed up to 80° C. to initiate polymerizationreaction and the reaction mixture was stirred as it was for 8 hours.After cooling, the reaction mixture was dripped into 250 ml of methanolto precipitate a polymer, which was recovered by filtration. Further,the recovered polymer was dissolved in 25 ml of chloroform. Thissolution was purified by dripping it into 250 ml of methanol toreprecipitate the polymer and dried in vacuum at 60° C. for 12 hours toobtain 1.11 g of the objective compound VCz-co-Ir(btp)₂[1-(StMe)-acac].Table 7 shows yields, results of GPC measurements, and Ir complexcontents measured by ICP elementary analyses.

EXAMPLES 68 TO 70

Copolymers were synthesized in the same manner as in Example 67 exceptthat in place of [1-(StMe)-acac] the polymerizable compounds prepared inExamples 64 to 66, respectively, were used. Table 7 shows yields,results of GPC measurements, and Ir complex contents measured by ICPelementary analyses.

TABLE 7 Ir Complex Recovery GPC Measurement Content Example Polymer (%)Mn Mw Mw/Mn (mol %) 67 VCz-co-Ir(btp)₂[1-(StMe)acac] 71 4500 10800 2.400.59 68 VCz-co-Ir(btp)₂[1-(MA-Ph-Me)acac] 73 4300 10700 2.52 0.81 69VCz-co-Ir(btp)₂[1-(MOI-Ph-Me)acac] 58 4300 10900 2.55 0.89 70VCz-co-Ir(btp)₂(1-MOI-acac) 72 4400 11800 2.66 0.61 Mn: Numer averagemolecular weight Mw: Weight average molecular weight

EXAMPLES 71 TO 74 Fabrication and Evaluation of Organic Light EmittingElement

Organic light emitting devices were fabricated in the same manner as inExamples 57 to 62 except that the light emitting materials shown inTable 8 were used and their luminance was measured.

As a result, the luminescence starting voltage and initial luminance at20 V as shown in Table 8 were obtained (average of four devices for eachlight emitting material)

TABLE 8 Luminescence 20 V Starting Initial Light Emitting Materialvoltage Luminance Example Polymer Example (V) (cd/m²) 71VCz-co-Ir(btp)₂[1-(StMe)acac] 70 9 420 72VCz-co-Ir(btp)₂[1-(MA-Ph-Me)acac] 71 9 400 73VCz-co-Ir(btp)₂[1-(MOI-Ph-Me)acac] 72 9 360 74VCz-co-Ir(btp)₂(1-MOI-acac) 73 9 390

EXAMPLE 75 Synthesis of a Polymerizable Compoundbis(2-(4-methacryloyloxyphenyl)pyridinato) (acetylacetonato) Iridium(III) (Hereinafter Abbreviated as Ir(4-MA-PPy)₂(acac))

(1) As shown in the Reaction Scheme below, a binuclear complex ofiridium, di(μ-chloro)tetrakis(2-(4-hydroxyphenyl)pyridine) diiridium(III) (hereinafter abbreviated as [Ir(4-HO-PPy)₂Cl]₂) was synthesized.

That is, 0.86 g (5.0 mmol) of 4-HO-PPy prepared in the same manner as inExample 27(1) and (2) and 1.00 g of sodium hexachloroiridate (III)hydrate were dissolved in 40 ml of a mixed solvent of2-ethoxyethanol:water=3:1 (by volume ratio) and argon gas was blown intothe obtained solution for 30 minutes. Thereafter, the solution wasstirred under reflux for 6 hours. Then, the solvent was distilled offand the remaining solid was washed with distilled water and withchloroform, followed by drying in vacuum for 5 hours to obtain 0.63 g of[Ir (4-HO-PPy)₂Cl]₂ as yellow powder. Yield: 74%. Identification wasperformed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (DMSO-d₆, ppm): δ 9.66 (d, 2H, J=5.9 Hz), 9.38 (d, 2H, J=5.7 Hz),8.0-7.9 (m, 8H), 7.61 (d, 2H, J=8.1 Hz), 7.54 (d, 2H, J=8.4 Hz), 7.38(dd, 2H, J=6.2, 6.2 Hz), 7.26 (dd, 2H, J=5.7, 5.7 Hz), 6.33 (dd, 2H,J=8.6, 2.4 Hz), 6.28 (dd, 2H, J=8.4, 2.4 Hz), 5.67 (d, 2H, J=2.2 Hz),5.12 (d, 2H, J=2.4 Hz).

Elementary analysis Calcd: C, 46.52; H, 2.84; N, 4.93. Found: C, 46.66;H, 2.89; N, 4.90.

(2) As shown in the Reaction Scheme below,bis(2-(4-hydroxyphenyl)pyridinato) (acetylacetonato) iridium (III)(hereinafter abbreviated as (Ir(4-HO-PPy)₂(acac)) was synthesized.

That is, 20 ml of dry N,N-dimethylformamide (hereinafter abbreviated asDMF) and 60.0 mg (0.6 mmol) of 2,4-pentanedione were added to 227.2 mg(0.2 mmol) of [Ir(4-HO-PPy)₂Cl]₂ and 212.0 mg (2.0 mmol) of sodiumcarbonate under argon stream and the mixture was stirred at 80° C. for 2hours. After adding 50 ml of water, the reaction mixture was extractedwith chloroform and washed with saturated saline and with distilledwater. The organic layer was dried over magnesium sulfate and thenconcentrated and purified by column chromatography (silica gel,methanol:chloroform=5:95 by volume ratio). Further purification of theproduct by recrystallization from hexane/acetone afforded 152.0 mg ofIr(4-HO-PPy)₂(acac) as yellow crystal. Yield: 60%. Identification wasperformed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (CDCl₃, ppm): δ 8.35 (d, 2H, J=5.7 Hz), 7.7-7.6 (m, 4H), δ 7.41(d, 2H, J=10.6 Hz), 7.04 (ddd, 2H, J=5.8, 5.8, 2.4 Hz), 6.33 (dd, 2H,J=8.4, 2.4 Hz), 5.70 (d, 2H, J=2.7 Hz), 5.24 (s, 1H), 1.78 (s, 6H).

Elementary analysis Calcd: C, 51.34; H, 3.67; N, 4.43. Found: C, 51.31;H, 3.76; N, 4.40.

(3) As shown in the Reaction Scheme below, Ir(4-MA-PPy)₂(acac) wassynthesized.

That is, 63.2 mg (0.1 mmol) of Ir(4-HO-PPy)₂(acac) and 0.1 mg of2,6-di-tertbutyl-4-methylphenol (hereinafter abbreviated as BHT) weredissolved in 10 ml of dry THF under argon stream. To the solution wereadded 81.0 mg (0.8 mmol) of triethylamine and 41.8 mg (0.4 mmol) ofmethacryloyl chloride and the mixture was stirred at room temperaturefor 2 hours. 100 ml of water was added to the reaction mixture and thereaction mixture was extracted with chloroform. The extract was washedwith saturated saline and with distilled water. The organic layer wasdried over magnesium sulfate, concentrated and purified by columnchromatography (silica gel, methanol:chloroform=2:98 by volume ratio).Recrystallization of the product from hexane/chloroform afforded 65.3 mgof Ir(4-MA-PPy)₂(acac) as yellow crystal. Yield: 85%. Identification wasperformed by elementary analysis of C, H and N and ¹H-NMR.

¹H-NMR (DMSO-d₆, ppm): δ 8.38 (d, 2H, J=5.7 Hz), 8.15 (d, 2H, J=8.6 Hz),7.95 (m, 2H), 7.78 (d, 2H, J=8.9 Hz), 7.39 (m, 2H), 6.61 (dd, 2H, J=8.4,2.4 Hz), 6.09 (s, 2H), 5.76 (s, 2H), 5.71 (d, 2H, J=2.4 Hz), 5.27 (s,1H), 1.86 (s, 3H), 1.73 (s, 3H).

Elementary analysis Calcd: C, 54.75; H, 4.07; N, 3.65. Found: C, 54.68;H, 4.13; N, 3.61.

EXAMPLE 76 Synthesis of a Polymerizable Compoundbis(2-(4-(2-methacryloyloxy)ethylcarbamoyloxy)phenyl)pyridinato)(acetylacetonato) Iridium (III) (Hereinafter Abbreviated asIr(4-MOI-PPy)₂(acac))

As shown in the Reaction Scheme below, Ir (4-MOI-PPy)₂(acac) wassynthesized.

That is, 63.2 mg (0.1 mmol) of Ir(4-HO-PPy)₂(acac), the intermediate inExample 75, 0.2 mg of BHT and 1.3 mg of dibutyltin (IV) dilaurate(hereinafter abbreviated as DBTL) were dissolved in 10 ml of dry THFunder argon stream. To this solution was further added 62.0 mg (0.4mmol) of 2-methacryloyloxyethyl isocyanate (Trade name “Karenz MOI”,manufactured by Showa Denko K. K., hereinafter sometimes referred to as“MOI”) and the mixture was stirred at 50° C. for 1 hour. To the reactionmixture was added 50 ml of water and then the reaction mixture wasextracted with chloroform. The extract was washed with saturated salineand with distilled water. After drying the organic layer over magnesiumsulfate, it was concentrated and purified by column chromatography(silica gel, methanol:chloroform=5:95 (by volume ratio)).Recrystallization of the purified product from hexane/chloroformafforded 73.5 mg of Ir(4-MOI-PPy)₂(acac) as yellow crystal. Yield: 78%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (DMSO-d₆, ppm): δ 8.37 (d, 2H, J=5.9 Hz), 8.1 (d, 2H, J=7.8 Hz),7.93 (dd, 2H, J=8.0, 8.0 Hz), 7.70 (d, 2H, J=8.6 Hz), 7.64 (t, 2H), 7.4(dd, 2H, J=6.3, 6.3 Hz), 6.56 (dd, 2H, J=8.2, 2.3 Hz), 6.02 (s, 2H),5.7-5.6 (m, 4H), 5.26 (s, 1H), 4.06 (t, 4H, J=5.4 Hz), 3.3 (m, 4H,overlapped with H₂O), 1.85 (s, 6H), 1.73 (s, 6H).

Elementary analysis Calcd: C, 52.28; H, 4.39; N, 5.95. Found: C, 52.22;H, 4.47; N, 5.86.

EXAMPLE 77 Synthesis of a Polymerizable Compoundbis(2-(4-(4-vinylbenzyloxy)phenyl)pyridinato) (acetylacetonato) Iridium(III) (Hereinafter Abbreviated as Ir(4-ST-PPy)₂(acac))

As shown in the Reaction Scheme below, Ir (4-ST-PPy)₂(acac) wassynthesized.

That is, 63.2 mg (0.1 mmol) of Ir(4-HO-PPy)₂(acac), the intermediate inExample 75, 0.2 mg of BHT and 138.2 mg (1.0 mmol) of potassium carbonatewere dissolved in 10 ml dry DMF under argon stream. To this solution wasadded 61.0 mg (0.4 mmol) of 4-vinylbenzyl chloride, and the mixture wasstirred at 80° C. for 6 hours. To the reaction mixture was added 50 mlof water and the reaction mixture was extracted with chloroform. Theextract was washed with saturated saline and with distilled water. Afterdrying the organic layer over magnesium sulfate, it was concentrated andpurified by column chromatography (silica gel, methanol:chloroform=5:95(by volume ratio)). Recrystallization of the purified product fromhexane/chloroform afforded 62.2 mg of Ir(4-ST-PPy)₂(acac) as yellowcrystal. Yield: 72%. Identification was performed by ¹H-NMR andelementary analysis of C, H and N.

¹H-NMR (DMSO-d₆, ppm) δ 8.37 (d, 2H, J=5.9 Hz), 8.13 (d, 2H, J=8.4 Hz),8.0-7.9 (m, 2H), 7.75 (d, 2H, J=8.9 Hz), 7.5-7.3 (m, 10H), 6.73 (m, 2H),6.59 (dd, 2H, J=8.2, 2.4 Hz), 5.88 (d, 2H, J=17.8 Hz), 5.73 (d, 2H,J=2.4 Hz), 5.3-5.2 (m, 7H), 1.78 (s, 3H).

Elementary analysis Calcd: C, 62.55; H, 4.55; N, 3.24. Found: C, 62.58;H, 4.65; N, 3.20.

EXAMPLE 78 Second Method for the Synthesis of a Polymerizable CompoundIr(4-MA-PPy)₂(acac)

(1) As shown in the Reaction Scheme below,2-(4-methacryloyloxyphenyl)pyridine (hereinafter abbreviated as4-MA-PPy) was synthesized.

That is, 3.42 g (20.0 mmol) of 4-HO-PPy, the intermediate in Example 75was dissolved in 20 ml of dry dichloromethane under argon stream. Tothis solution was added 6.07 g (60.0 mmol) of triethylamine and 3.14 g(30.0 mmol) of methacryloyl chloride was dripped to the mixture over 1hour and then the resultant mixture was stirred at room temperature for2 hours. To the reaction mixture was added 100 ml of water and themixture the reaction mixture was extracted with chloroform. The extractwas washed with saturated saline and with water. After drying theorganic layer over magnesium sulfate, it was concentrated and purifiedby column chromatography (silica gel, chloroform). Recrystallization ofthe purified product from hexane/chloroform afforded 4.16 g of 4-MA-PPyas colorless crystal. Yield: 87%. Identification was performed by ¹H-NMRand elementary analysis of C, H and N.

¹H-NMR (CDCl₃, ppm): δ 8.63 (d, 1H, J=4.9 Hz), 7.98 (d, 2H, J=8.6 Hz),7.5-7.6 (m, 2H), 7.2-7.1 (m, 3H), 6.01 (s, 1H), 5.53 (s 1H), 1.83 (s,3H).

Elementary analysis Calcd: C, 75.30; H, 5.48; N, 5.85. Found: C, 75.26;H, 5.53; N, 5.79.

(2) As shown in the Reaction Scheme below, a binuclear complex ofiridium, di(μ-chloro)tetrakis(2-(4-methacryloyloxyphenyl)pyridine)diiridium (III) (hereinafter abbreviated as [Ir(4-MA-PPy)₂Cl]₂) wassynthesized.

That is, 1.20 g (5.0 mmol) of 4-MA-PPy and 1.00 g of sodiumhexachloroiridate (III) hydrate were dissolved in 40 ml of a mixedsolvent of 2-ethoxyethanol:water=3:1 (by volume ratio) and argon gas wasblown into the obtained solution for 30 minutes. Thereafter, thesolution was stirred under reflux for 6 hours. The precipitate formedwas collected by filtration and washed with ethanol and with a smallamount of acetone, followed by drying in vacuum for 5 hours to obtain0.87 g of [Ir(4-MA-PPy)₂Cl]₂ as yellow powder. Yield: 82%.Identification was performed by ¹H-NMR and elementary analysis of C, Hand N.

¹H-NMR (DMSO-d₆, ppm): δ 9.64 (d, 2H, J=5.7 Hz), 9.37 (d, 2H, J=5.7 Hz),8.2-8.1 (m, 4H), 7.75 (m, 4H), 7.6-7.5 (m, 8H), 6.56 (m, 4H), 5.87 (d,2H, J=2.4 Hz), 5.38 (d, 2H, J=2.4 Hz), 6.09 (s, 2H), 6.03 (s, 2H), 5.79(s, 2H), 5.74 (s, 2H), 1.89 (s, 6H), 1.87 (s, 6H).

Elementary analysis Calcd: C, 51.17; H, 3.44; N, 3.98. Found: C, 51.13;H, 3.51; N, 3.97.

(3) As shown in the Reaction Scheme below, Ir(4-MA-PPy)₂(acac) wassynthesized.

That is, 20 ml of dry DMF and 60.0 mg (0.6 mmol) of 2,4-pentanedionewere added to 281.7 mg (0.2 mmol) of [Ir(4-MA-PPy)₂Cl]₂ and 212.0 mg(2.0 mmol) of sodium carbonate. The mixture was stirred at 80° C. for 2hours. After adding 100 ml of water to the reaction mixture, thereaction mixture was extracted with chloroform and the extract waswashed with saturated saline and with distilled water. After drying theorganic layer over magnesium sulfate, it was concentrated and purifiedby column chromatography (silica gel, methanol:chloroform=2:98 (byvolume ratio)). Recrystallization of the purified product fromhexane/chloroform afforded 221.1 mg of Ir(4-MA-PPy)₂(acac) as yellowcrystal. Yield: 72%. Identification was performed by ¹H-NMR andelementary analysis of C, H and N, which verified that this wasidentical with the compound synthesized in Example 75.

EXAMPLE 79 Synthesis of N-vinylcarbazole/Ir(4-MA-PPy)₂(acac) Copolymer(Hereinafter, Abbreviated as VCz-co-Ir(4-MA-PPy)₂(acac))

The titled copolymer was synthesized as a light emitting materialcontaining Ir(4-MA-PPy)₂(acac) as a unit having the function ofluminescence and N-vinylcarbazole as a unit having the function of holetransportation.

966 mg (5.0 mmol) of N-vinylcarbazole, 38.4 mg (0.05 mmol) ofIr(4-MA-PPy)₂(acac), and 8.2 mg (0.05 mmol) of AIBN were dissolved in 25ml of dry toluene and argon was blown into the obtained solution for 1hour. This solution was warmed up to 80° C. to initiate polymerizationreaction and the reaction mixture was stirred as it was for 8 hours.After cooling, the reaction mixture was dripped into 250 ml of methanolto precipitate a polymer, which was recovered by filtration. Further,the recovered polymer was dissolved in 25 ml of chloroform. Thissolution was purified by dripping it into 250 ml of methanol toreprecipitate the polymer and dried in vacuum at 60° C. for 12 hours toobtain 755 mg of the objective compound VCz-co-Ir(4-MA-PPy)₂(acac).Table 9 shows yields, results of GPC measurements, and Ir complexcontents measured by ICP elementary analyses. Ir (4-MA-PPy)₂(acac),which was a bifunctional monomer, had a low degree of crosslinking sothat produced no insoluble matter since its amount was very small ascompared with the amount of N-vinylcarbazole.

EXAMPLES 80 TO 81

Copolymers were synthesized in the same manner as in Example 79 exceptthat in place of Ir(4-MA-PPy)₂(acac), equivalent moles of thepolymerizable compounds prepared in Examples 76 to 77, respectively,were used. Table 9 shows yields, results of GPC measurements, and Ircomplex contents measured by ICP elementary analyses.

TABLE 9 Ir Complex Recovery GPC Measurement Content Example Polymer (%)Mn Mw Mw/Mn (mol %) 79 VCz-co-Ir(4-MA-PPy)₂(acac) 75 7100 29100 4.101.09 80 VCz-co-Ir(4-MOI-PPy)₂(acac) 72 6500 28300 4.35 1.07 81VCz-co-Ir(4-ST-PPy)₂(acac) 77 6600 30600 4.64 1.06 Mn: Number averagemolecular weigth Mw: Weight average molecular weight

EXAMPLES 82 TO 84 Fabrication and Evaluation of Organic Light EmittingElement

Organic light emitting devices were fabricated in the same manner as inExamples 57 to 62 except that the light emitting materials shown inTable 9 were used and their luminance was measured.

As a result, the luminescence starting voltage, initial luminance at 15V, and luminance after 200 hours' continuous luminescence at a fixedvoltage of 15 V as shown in Table 10 were obtained (as average values offour devices for each light emitting material).

COMPARATIVE EXAMPLE 4

Organic light emitting devices were fabricated in the same manner as inExamples 82 to 84 except that a coating solution was prepared bydissolving 19.5 mg of poly(N-vinylcarbazole) (manufactured by TokyoKasei Kogyo Co., Ltd.) as a hole transporting material, 1.5 mg of acompound of the formula

synthesized by the known method (S. Lamansky, et al., InorganicChemistry, 40, 1704 (2001)) as a light emitting material, and 9.0 mg of2-(4-biphenyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD)(manufactured by Tokyo Kasei Kogyo Co., Ltd.) were dissolved in 2970 mgof chloroform (manufactured by Wako Pure Chemical Industries, Ltd.) andthe obtained solution was filtered through a filter having a pore sizeof 0.2 μm, and luminance of the devices was measured. As a result, theluminescence starting voltage, initial luminance at 15 V, and luminanceafter 200 hours' continuous luminescence at a fixed voltage of 15 V asshown in Table 10 were obtained (as average values of four devices foreach light emitting material).

TABLE 10 Luminescence Starting Voltage 15 V Limunance (cd/m²) Example(V) Initial After 200 Hours 82 7 370 330 83 7 330 290 84 7 410 350Comparative 7 360 120 Example 4

INDUSTRIAL APPLICABILITY

By using the polymer light emitting material of the present invention,energy in an excited triplet state can be efficiently converted to lightemission or luminescence so that an organic light emitting deviceexhibiting high luminance and high durability can be provided.

Furthermore, by using non-crosslinking and/or crosslinking polymer lightemitting material obtained by forming the polymerizable light emittingcompound into a film, an organic light emitting device having goodprocessability can be provided.

The polymerizable compounds of the formulae (C-1), (D-1), (E-1), (F-1)or (G-1) give rise to novel polymers containing an iridium complex part.By using such polymers as a light emitting materials for organic lightemitting devices, organic light emitting devices that efficiently emitfrom an excited triplet state, are excellent in stability, can bedesigned so as to have a large area and hence are suitable for massproduction can be provided.

1-67. (canceled)
 68. A polymer light-emitting material obtained bypolymerizing a polymerizable composition containing at least onepolymerizable light-emitting compound represented by the followingformula (G-1):

wherein L represents a monovalent anionic bidentate ligand; X^(G)represents a substituent having a polymerizable functional group; and R¹to R⁷ independently represent a hydrogen atom, a halogen atom, a nitrogroup, an amino group, a sulfonic acid group, a sulfonic acid estergroup, or an organic group having 1 to 20 carbon atoms which may haveone or more heteroatoms.
 69. The polymer light-emitting materialaccording to claim 68, wherein the polymerizable light-emitting compoundis a polymerizable compound represented by the following formula (G-2):

wherein A¹ to A³ independently represent a hydrogen atom or an organicgroup having 1 to 20 carbon atoms which may have one or moreheteroatoms; X^(G) represents a substituent having a polymerizablefunctional group; and R¹ to R⁷ independently represent a hydrogen atom,a halogen atom, a nitro group, an amino group, a sulfonic acid group, asulfonic acid ester group, or an organic group having 1 to 20 carbonatoms which may have one or more heteroatoms.
 70. The polymerlight-emitting material according to claim 68, wherein the polymerizablelight-emitting compound is a polymerizable compound represented by thefollowing formula (G-3):


71. The polymer light-emitting material according to claim 68, whereinthe polymerizable light-emitting compound is a polymerizable compoundrepresented by the following formula (G-4):


72. The polymer light-emitting material according to claim 68, whereinthe polymerizable light-emitting compound is a polymerizable compoundrepresented by the following formula (G-5):


73. A layer containing a light-emitting material for organiclight-emitting device, wherein a light-emitting material is a polymerlight-emitting material described in claim
 68. 74. The layer containinga light-emitting material for organic light-emitting device according toclaim 73, wherein the polymer light-emitting material is obtained byforming a polymerizable composition containing at least onelight-emitting compound into a film and then polymerizing it.
 75. Anorganic light-emitting device comprising the polymer light-emittingmaterial described in claim
 68. 76.-91. (canceled)